diff --git a/changes/29.0.6.md b/changes/29.0.6.md
new file mode 100644
index 000000000..095f85a89
--- /dev/null
+++ b/changes/29.0.6.md
@@ -0,0 +1,6 @@
+* Fix broken glyphs for serifed variants of LATIN SMALL LETTER S WITH CURL (`U+1DF1E`).
+* Improve glyph visual for Bulgarian localization form for CYRILLIC CAPITAL LETTER EF (`U+0424`) under slab.
+* Make descender serif of CYRILLIC {CAPITAL|SMALL} LETTER KOPPA (`U+0480`..`U+0481`) appear under any serifed variants for `C`/`c`.
+* Make presence of descender serif automatic for LATIN CAPTITAL LETTER BETA (`U+A7B4`).
+* Remove tailless variants for TURNED GREEK SMALL LETTER IOTA (`U+2129`).
+* Make presence of top-right serif automatic for CYRILLIC SMALL LIGATURE EN GHE (`U+04A5`) under `cyrl/en`=`tailed-top-left-serifed`.
diff --git a/packages/font-glyphs/src/letter/greek/upper-phi.ptl b/packages/font-glyphs/src/letter/greek/upper-phi.ptl
index 8bb7ced19..fc911bf88 100644
--- a/packages/font-glyphs/src/letter/greek/upper-phi.ptl
+++ b/packages/font-glyphs/src/letter/greek/upper-phi.ptl
@@ -95,8 +95,8 @@ glyph-block Letter-Greek-Upper-Phi : begin
 		local df : include : DivFrame para.diversityM 3
 		include : df.markSet.capital
 
-		local top : CAP + LongJut - HalfStroke
-		local bot : 0   - LongJut + HalfStroke
+		local top : CAP + LongJut - [if SLAB 0 HalfStroke]
+		local bot : 0   - LongJut + [if SLAB 0 HalfStroke]
 
 		include : ExtendAboveBaseAnchors top
 		include : ExtendBelowBaseAnchors bot
diff --git a/packages/font-glyphs/src/letter/latin/c.ptl b/packages/font-glyphs/src/letter/latin/c.ptl
index 68056337b..df5585160 100644
--- a/packages/font-glyphs/src/letter/latin/c.ptl
+++ b/packages/font-glyphs/src/letter/latin/c.ptl
@@ -255,14 +255,14 @@ glyph-block Letter-Latin-C : begin
 			difference base
 				Rect (top / 2) Descender (Middle + [HSwToV Stroke]) (Width * 4)
 				Rect (XH / 2) [mix Stroke Hook 0.5] Middle (Width * 4)
-			if styBot [HSerif.mb (Middle + [HSwToV HalfStroke]) Descender MidJutSide] [no-shape]
+			if styTop [HSerif.mb (Middle + [HSwToV HalfStroke]) Descender MidJutSide] [no-shape]
 
-		create-glyph "cyrl/Koppa.\(suffix)" : glyph-proc
+		if [not styBot] : create-glyph "cyrl/Koppa.\(suffix)" : glyph-proc
 			include : MarkSet.capDesc
 			local lf : CLetterForm [DivFrame 1] sty styBot CAP 0
 			include : KoppaShapeT sty styBot CAP : union [lf.baseTopOnly] [lf.topSerif]
 
-		create-glyph "cyrl/koppa.\(suffix)" : glyph-proc
+		if [not styBot] : create-glyph "cyrl/koppa.\(suffix)" : glyph-proc
 			include : MarkSet.p
 			local lf : CLetterForm [DivFrame 1] sty styBot XH 0
 				ada -- SmallArchDepthA
@@ -318,8 +318,8 @@ glyph-block Letter-Latin-C : begin
 	select-variant 'cHookTop' 0x188
 	select-variant 'stretchedC' 0x297 (follow -- 'c')
 
-	select-variant 'cyrl/Koppa' 0x480 (follow -- 'C')
-	select-variant 'cyrl/koppa' 0x481 (follow -- 'c')
+	select-variant 'cyrl/Koppa' 0x480 (follow -- 'CTopSerifOnly')
+	select-variant 'cyrl/koppa' 0x481 (follow -- 'cTopSerifOnly')
 
 	select-variant 'C/descBase'
 	select-variant 'c/descBase'
diff --git a/packages/font-glyphs/src/letter/latin/lower-il.ptl b/packages/font-glyphs/src/letter/latin/lower-il.ptl
index 31699b9ab..2a06c7f0a 100644
--- a/packages/font-glyphs/src/letter/latin/lower-il.ptl
+++ b/packages/font-glyphs/src/letter/latin/lower-il.ptl
@@ -319,7 +319,7 @@ glyph-block Letter-Latin-Lower-I : begin
 		alias 'cyrl/Iota' 0xA646 'latn/Iota'
 
 		CreateTurnedLetter 'turni' 0x1D09 'i' HalfAdvance (XH / 2)
-		CreateTurnedLetter 'turniota' 0x2129 'grek/iota' HalfAdvance (XH / 2)
+		CreateTurnedLetter 'grek/turniota' 0x2129 'latn/iota' HalfAdvance (XH / 2)
 
 		CreateAccentedComposition      'cyrl/ghe.SRB' null 'dotlessi/tailed'   'macronAbove'
 		CreateMultiAccentedComposition 'cyrl/gje.SRB' null 'dotlessi/tailed' { 'macronAbove' 'acuteAbove' }
diff --git a/packages/font-glyphs/src/letter/latin/s.ptl b/packages/font-glyphs/src/letter/latin/s.ptl
index 0e45ee490..bd7d1e25f 100644
--- a/packages/font-glyphs/src/letter/latin/s.ptl
+++ b/packages/font-glyphs/src/letter/latin/s.ptl
@@ -335,13 +335,12 @@ glyph-block Letter-Latin-S : begin
 				flat (df.rightSB - 1) Descender [widths.lhs sw]
 				curl df.rightSB Descender
 
-		create-glyph "sCurlyTail.\(suffix)" : glyph-proc
+		if [not doBS] : create-glyph "sCurlyTail.\(suffix)" : glyph-proc
 			local df : include DfLower
 			include : df.markSet.e
 			local sw : AdviceStroke2 2 3 XH df.div
 			include : SmallSStrokeImpl df doTS CURLY-TAIL sw EssLower
-			include : SAutoSlabStart doTS XH sw Hook
-			include : SAutoSlabEnd   doBS 0  sw Hook
+			include : SAutoSlabStart df doTS XH sw Hook
 
 	select-variant 'S' 'S'
 	link-reduced-variant 'S/sansSerif' 'S' MathSansSerif
diff --git a/packages/font-glyphs/src/letter/latin/upper-b.ptl b/packages/font-glyphs/src/letter/latin/upper-b.ptl
index 4757cad1b..60bc7e222 100644
--- a/packages/font-glyphs/src/letter/latin/upper-b.ptl
+++ b/packages/font-glyphs/src/letter/latin/upper-b.ptl
@@ -166,12 +166,12 @@ glyph-block Letter-Latin-Upper-B : begin
 			body CAP currencySw ts bs
 			difference [BitcoinBar : AdviceStroke 5] [mask CAP : AdviceStroke2 2 3 CAP]
 
-		create-glyph "latn/Beta.\(suffix)" : glyph-proc
+		if (!bs) : create-glyph "latn/Beta.\(suffix)" : glyph-proc
 			include : MarkSet.capDesc
 			include : LeaningAnchor.Below.VBar.l SB
 			include : body CAP [AdviceStroke2 2 3 CAP] ts false
 			include : VBar.l SB Descender 0
-			if bs : begin
+			if SLAB : begin
 				local sf : SerifFrame.fromDf [DivFrame 1] CAP Descender
 				include sf.lb.fullSide
 
@@ -180,7 +180,7 @@ glyph-block Letter-Latin-Upper-B : begin
 	select-variant 'currency/baht' 0xE3F (follow -- 'B')
 	select-variant 'currency/bitcoin' 0x20BF (follow -- 'B')
 	select-variant 'BStroke' 0x243 (follow -- 'B')
-	select-variant 'latn/Beta' 0xA7B4 (follow -- 'B')
+	select-variant 'latn/Beta' 0xA7B4
 	alias 'grek/Beta' 0x392 'B'
 	alias-reduced-variant 'grek/Beta/sansSerif' 'grek/Beta' 'B/sansSerif' MathSansSerif
 	alias 'cyrl/Ve' 0x412 'B'
diff --git a/packages/font-glyphs/src/letter/latin/upper-h.ptl b/packages/font-glyphs/src/letter/latin/upper-h.ptl
index 10b76f972..8dbd88ae7 100644
--- a/packages/font-glyphs/src/letter/latin/upper-h.ptl
+++ b/packages/font-glyphs/src/letter/latin/upper-h.ptl
@@ -94,7 +94,7 @@ glyph-block Letter-Latin-Upper-H : begin
 		serifless                        { HShape       HTurned SLAB-NONE                  false }
 		tailedSerifless                  { TailedHShape HTurned SLAB-NONE                  false }
 		topLeftSerifed                   { HShape       HTurned SLAB-TOP-LEFT              false }
-		tailedTopLeftSerifed             { TailedHShape HTurned SLAB-TOP-LEFT              false }
+		tailedTopLeftSerifed             { TailedHShape HTurned SLAB-TOP-LEFT              SLAB  }
 		topLeftBottomRightSerifed        { HShape       HTurned SLAB-TOP-LEFT-BOTTOM-RIGHT true  }
 		serifed                          { HShape       HTurned SLAB-ALL                   true  }
 		tailedSerifed                    { TailedHShape HTurned SLAB-TAILED-CYRILLIC       true  }
diff --git a/params/variants.toml b/params/variants.toml
index 0f4f75b4a..c6159919d 100644
--- a/params/variants.toml
+++ b/params/variants.toml
@@ -71,6 +71,7 @@ descriptionAffix = "mostly symmetric shape"
 selectorAffix.B = "standard"
 selectorAffix."B/sansSerif" = "standard"
 selectorAffix.Bhookleft = "standard"
+selectorAffix."latn/Beta" = "standard"
 selectorAffix.BBar = "standard"
 selectorAffix.smcpB = "standard"
 selectorAffix.smcpBBar = "standard"
@@ -81,6 +82,7 @@ descriptionAffix = "more asymmetric shape"
 selectorAffix.B = "moreAsymmetric"
 selectorAffix."B/sansSerif" = "moreAsymmetric"
 selectorAffix.Bhookleft = "moreAsymmetric"
+selectorAffix."latn/Beta" = "moreAsymmetric"
 selectorAffix.BBar = "moreAsymmetric"
 selectorAffix.smcpB = "standard"
 selectorAffix.smcpBBar = "standard"
@@ -94,6 +96,7 @@ keyAffix = ""
 selectorAffix.B = ""
 selectorAffix."B/sansSerif" = ""
 selectorAffix.Bhookleft = ""
+selectorAffix."latn/Beta" = ""
 selectorAffix.BBar = ""
 selectorAffix.smcpB = ""
 selectorAffix.smcpBBar = ""
@@ -104,6 +107,7 @@ descriptionAffix = "interrupted middle bar"
 selectorAffix.B = "interrupted"
 selectorAffix."B/sansSerif" = "interrupted"
 selectorAffix.Bhookleft = "interrupted"
+selectorAffix."latn/Beta" = "interrupted"
 selectorAffix.BBar = ""
 selectorAffix.smcpB = "interrupted"
 selectorAffix.smcpBBar = ""
@@ -115,6 +119,7 @@ descriptionJoiner = "without"
 selectorAffix.B = "serifless"
 selectorAffix."B/sansSerif" = "serifless"
 selectorAffix.Bhookleft = "serifless"
+selectorAffix."latn/Beta" = "serifless"
 selectorAffix.BBar = "serifless"
 selectorAffix.smcpB = "serifless"
 selectorAffix.smcpBBar = "serifless"
@@ -125,6 +130,7 @@ descriptionAffix = "serifs at top"
 selectorAffix.B = "unilateralSerifed"
 selectorAffix."B/sansSerif" = "serifless"
 selectorAffix.Bhookleft = "serifless"
+selectorAffix."latn/Beta" = "unilateralSerifed"
 selectorAffix.BBar = "unilateralSerifed"
 selectorAffix.smcpB = "unilateralSerifed"
 selectorAffix.smcpBBar = "unilateralSerifed"
@@ -135,6 +141,7 @@ descriptionAffix = "serifs at both top and bottom"
 selectorAffix.B = "bilateralSerifed"
 selectorAffix."B/sansSerif" = "serifless"
 selectorAffix.Bhookleft = "bilateralSerifed"
+selectorAffix."latn/Beta" = "unilateralSerifed"
 selectorAffix.BBar = "bilateralSerifed"
 selectorAffix.smcpB = "bilateralSerifed"
 selectorAffix.smcpBBar = "bilateralSerifed"