diff --git a/src/conformance/property-harness.ts b/src/conformance/property-harness.ts
index 9862945..5013bfa 100644
--- a/src/conformance/property-harness.ts
+++ b/src/conformance/property-harness.ts
@@ -23,7 +23,7 @@ export const propertyTimeout = 600000
 const depthIdentifier = fc.createDepthIdentifier()
 const emptyCell: AdfNode = { content: [{ type: 'paragraph' }], type: 'tableCell' }
 const flatCommonMarkShapeWeight = 4
-export const markdownPieces = fc.constantFrom(...'aZ09 \t\n!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~é\xa0🎉日ー한', '𠀀', '==', '[!NOTE]', '[x]', 'ab:', 'http://', directivePrefix, `${directivePrefix}a[`, `${directivePrefix}a{`)
+export const markdownPieces = fc.constantFrom(...'aZ09 \t\n!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~é\xa0🎉日ー한𠀀', '==', '[!NOTE]', '[x]', 'ab:', 'http://', directivePrefix, `${directivePrefix}a[`, `${directivePrefix}a{`)
 const nestingCommonMarkShapeWeight = 21
 const spelledTypes = new Set(['text', ...Object.keys(blockNodes), ...Object.keys(inlineNodes), ...Object.keys(markAttributes)])
 
diff --git a/src/markdown/plain-conventions.ts b/src/markdown/plain-conventions.ts
index 97a9d8a..c5d6f09 100644
--- a/src/markdown/plain-conventions.ts
+++ b/src/markdown/plain-conventions.ts
@@ -16,8 +16,8 @@ const alertWords: Readonly<Record<string, string>> = {
   warning: 'WARNING',
 }
 
-// ー, ｰ and the kana voicing marks are Script=Common; Script_Extensions would also take Latin combining marks.
-const boundingScript = /^[\u3099-\u309c\u30fc\uff70\uff9e\uff9f\p{Script=Han}\p{Script=Hangul}\p{Script=Hiragana}\p{Script=Katakana}\p{Script=Khmer}\p{Script=Lao}\p{Script=Myanmar}\p{Script=Thai}]$/u
+// ー, ｰ and the kana voicing marks sit outside the kana scripts; Script_Extensions would also take Latin combining marks.
+const boundingScript = /^[\u3099\u309a\u30fc\uff70\uff9e\uff9f\p{Script=Han}\p{Script=Hangul}\p{Script=Hiragana}\p{Script=Katakana}\p{Script=Khmer}\p{Script=Lao}\p{Script=Myanmar}\p{Script=Thai}]$/u
 
 const panelTypesByWord: Readonly<Record<string, string>> = {
   attention: 'warning',