diff --git a/packages/frontend-embed/src/components/EmNote.vue b/packages/frontend-embed/src/components/EmNote.vue
index f5b064c293..c8bea02135 100644
--- a/packages/frontend-embed/src/components/EmNote.vue
+++ b/packages/frontend-embed/src/components/EmNote.vue
@@ -149,7 +149,7 @@ const isRenote = Misskey.note.isPureRenote(note.value);
 
 const rootEl = shallowRef<HTMLElement>();
 const renoteTime = shallowRef<HTMLElement>();
-const appearNote = computed(() => getAppearNote(note.value));
+const appearNote = computed(() => getAppearNote(note.value) ?? note.value);
 const showContent = ref(false);
 const parsed = computed(() => appearNote.value.text ? mfm.parse(appearNote.value.text) : null);
 const isLong = shouldCollapsed(appearNote.value, []);
diff --git a/packages/frontend-embed/src/components/EmPagination.vue b/packages/frontend-embed/src/components/EmPagination.vue
index bd49d127a9..197584908c 100644
--- a/packages/frontend-embed/src/components/EmPagination.vue
+++ b/packages/frontend-embed/src/components/EmPagination.vue
@@ -244,7 +244,7 @@ const fetchMore = async (): Promise<void> => {
 			if (i === 10) item._shouldInsertAd_ = true;
 		}
 
-		const reverseConcat = _res => {
+		const reverseConcat = (_res: MisskeyEntity[]) => {
 			const oldHeight = scrollableElement.value ? scrollableElement.value.scrollHeight : getBodyScrollHeight();
 			const oldScroll = scrollableElement.value ? scrollableElement.value.scrollTop : window.scrollY;
 
diff --git a/packages/frontend-embed/src/components/EmReactionsViewer.vue b/packages/frontend-embed/src/components/EmReactionsViewer.vue
index f5aa6bdc3f..91a5cd0fdd 100644
--- a/packages/frontend-embed/src/components/EmReactionsViewer.vue
+++ b/packages/frontend-embed/src/components/EmReactionsViewer.vue
@@ -27,8 +27,8 @@ const initialReactions = new Set(Object.keys(props.note.reactions));
 const reactions = ref<[string, number][]>([]);
 const hasMoreReactions = ref(false);
 
-if (props.note.myReaction && !Object.keys(reactions.value).includes(props.note.myReaction)) {
-	reactions.value[props.note.myReaction] = props.note.reactions[props.note.myReaction];
+if (props.note.myReaction != null && !(props.note.myReaction in props.note.reactions)) {
+	reactions.value.push([props.note.myReaction, props.note.reactions[props.note.myReaction]]);
 }
 
 function onMockToggleReaction(emoji: string, count: number) {
diff --git a/packages/frontend-embed/src/components/I18n.vue b/packages/frontend-embed/src/components/I18n.vue
index 9866e50958..9bd699d5ac 100644
--- a/packages/frontend-embed/src/components/I18n.vue
+++ b/packages/frontend-embed/src/components/I18n.vue
@@ -46,6 +46,9 @@ const parsed = computed(() => {
 });
 
 const render = () => {
-	return h(props.tag, parsed.value.map(x => typeof x === 'string' ? (props.textTag ? h(props.textTag, x) : x) : slots[x.arg]()));
+	// slotsの型はTの条件型で決まり文字列インデックスアクセスができないため、
+	// frontend側の同名コンポーネント (packages/frontend/src/components/global/I18n.vue) と同じくanyでキャストする
+	// eslint-disable-next-line @typescript-eslint/no-explicit-any
+	return h(props.tag, parsed.value.map(x => typeof x === 'string' ? (props.textTag ? h(props.textTag, x) : x) : (slots as any)[x.arg]()));
 };
 </script>
diff --git a/packages/frontend-embed/src/custom-emojis.ts b/packages/frontend-embed/src/custom-emojis.ts
index d5b40885c1..e66a6b3112 100644
--- a/packages/frontend-embed/src/custom-emojis.ts
+++ b/packages/frontend-embed/src/custom-emojis.ts
@@ -45,11 +45,11 @@ export async function fetchCustomEmojis(force = false) {
 	set('lastEmojisFetchedAt', now);
 }
 
-let cachedTags;
+let cachedTags: string[] | null = null;
 export function getCustomEmojiTags() {
 	if (cachedTags) return cachedTags;
 
-	const tags = new Set();
+	const tags = new Set<string>();
 	for (const emoji of customEmojis.value) {
 		for (const tag of emoji.aliases) {
 			tags.add(tag);