diff --git a/packages/frontend/src/components/MkNote.vue b/packages/frontend/src/components/MkNote.vue
index 7ed8e51d3..735ec8656 100644
--- a/packages/frontend/src/components/MkNote.vue
+++ b/packages/frontend/src/components/MkNote.vue
@@ -263,7 +263,12 @@ const translation = ref<Misskey.entities.NotesTranslateResponse | null>(null);
 const translating = ref(false);
 const showTicker = (defaultStore.state.instanceTicker === 'always') || (defaultStore.state.instanceTicker === 'remote' && appearNote.value.user.instance);
 const canRenote = computed(() => ['public', 'home'].includes(appearNote.value.visibility) || (appearNote.value.visibility === 'followers' && appearNote.value.userId === $i?.id));
-const renoteCollapsed = ref(defaultStore.state.collapseRenotes && isRenote && (($i && ($i.id === note.value.userId || $i.id === appearNote.value.userId)) ?? (appearNote.value.myReaction != null)));
+const renoteCollapsed = ref(
+	defaultStore.state.collapseRenotes && isRenote && (
+		($i && ($i.id === note.value.userId || $i.id === appearNote.value.userId)) || // `||` must be `||`! See https://github.com/misskey-dev/misskey/issues/13131
+		(appearNote.value.myReaction != null)
+	)
+);
 
 /* Overload FunctionにLintが対応していないのでコメントアウト
 function checkMute(noteToCheck: Misskey.entities.Note, mutedWords: Array<string | string[]> | undefined | null, checkOnly: true): boolean;