diff --git a/packages/backend/src/core/FanoutTimelineEndpointService.ts b/packages/backend/src/core/FanoutTimelineEndpointService.ts
index 6253f792ed..97b617096a 100644
--- a/packages/backend/src/core/FanoutTimelineEndpointService.ts
+++ b/packages/backend/src/core/FanoutTimelineEndpointService.ts
@@ -120,6 +120,8 @@ export class FanoutTimelineEndpointService {
 				filter = (note) => {
 					if (isUserRelated(note, userIdsWhoBlockingMe, ps.ignoreAuthorFromBlock)) return false;
 					if (isUserRelated(note, userIdsWhoMeMuting, ps.ignoreAuthorFromMute)) return false;
+					if (isUserRelated(note.renote, userIdsWhoBlockingMe, ps.ignoreAuthorFromBlock)) return false;
+					if (isUserRelated(note.renote, userIdsWhoMeMuting, ps.ignoreAuthorFromMute)) return false;
 					if (!ps.ignoreAuthorFromMute && isRenote(note) && !isQuote(note) && userIdsWhoMeMutingRenotes.has(note.userId)) return false;
 					if (isInstanceMuted(note, userMutedInstances)) return false;
 
diff --git a/packages/backend/src/misc/is-user-related.ts b/packages/backend/src/misc/is-user-related.ts
index 862d6e6a38..9b3e22bc32 100644
--- a/packages/backend/src/misc/is-user-related.ts
+++ b/packages/backend/src/misc/is-user-related.ts
@@ -3,7 +3,17 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-export function isUserRelated(note: any, userIds: Set<string>, ignoreAuthor = false): boolean {
+import type { MiUser } from '@/models/_.js';
+
+interface NoteLike {
+	userId: MiUser['id'];
+	reply?: NoteLike | null;
+	renote?: NoteLike | null;
+	replyUserId?: MiUser['id'] | null;
+	renoteUserId?: MiUser['id'] | null;
+}
+
+export function isUserRelated(note: NoteLike | null, userIds: Set<string>, ignoreAuthor = false): boolean {
 	if (!note) {
 		return false;
 	}
@@ -12,13 +22,16 @@ export function isUserRelated(note: any, userIds: Set<string>, ignoreAuthor = fa
 		return true;
 	}
 
-	if (note.reply != null && note.reply.userId !== note.userId && userIds.has(note.reply.userId)) {
+	const replyUserId = note.replyUserId ?? note.reply?.userId;
+	if (replyUserId != null && replyUserId !== note.userId && userIds.has(replyUserId)) {
 		return true;
 	}
 
-	if (note.renote != null && note.renote.userId !== note.userId && userIds.has(note.renote.userId)) {
+	const renoteUserId = note.renoteUserId ?? note.renote?.userId;
+	if (renoteUserId != null && renoteUserId !== note.userId && userIds.has(renoteUserId)) {
 		return true;
 	}
 
 	return false;
 }
+