diff --git a/packages/backend/src/core/CustomEmojiService.ts b/packages/backend/src/core/CustomEmojiService.ts
index 1b545a124..f9368eb6d 100644
--- a/packages/backend/src/core/CustomEmojiService.ts
+++ b/packages/backend/src/core/CustomEmojiService.ts
@@ -19,6 +19,7 @@ import { UtilityService } from '@/core/UtilityService.js';
 import { query } from '@/misc/prelude/url.js';
 import type { Serialized } from '@/server/api/stream/types.js';
 import { ModerationLogService } from '@/core/ModerationLogService.js';
+import type { Config } from '@/config.js';
 
 const parseEmojiStrRegexp = /^(\w+)(?:@([\w.-]+))?$/;
 
@@ -31,6 +32,9 @@ export class CustomEmojiService implements OnApplicationShutdown {
 		@Inject(DI.redis)
 		private redisClient: Redis.Redis,
 
+		@Inject(DI.config)
+		private config: Config,
+
 		@Inject(DI.emojisRepository)
 		private emojisRepository: EmojisRepository,
 
@@ -330,9 +334,11 @@ export class CustomEmojiService implements OnApplicationShutdown {
 		if (name == null) return null;
 		if (host == null) return null;
 
+		const newHost = host === this.config.host ? null : host; 
+
 		const queryOrNull = async () => (await this.emojisRepository.findOneBy({
 			name,
-			host: host ?? IsNull(),
+			host: newHost ?? IsNull(),
 		})) ?? null;
 
 		const emoji = await this.cache.fetch(`${name} ${host}`, queryOrNull);
diff --git a/packages/backend/src/core/entities/NoteEntityService.ts b/packages/backend/src/core/entities/NoteEntityService.ts
index 7b54ce5c6..8892ed748 100644
--- a/packages/backend/src/core/entities/NoteEntityService.ts
+++ b/packages/backend/src/core/entities/NoteEntityService.ts
@@ -22,6 +22,7 @@ import type { CustomEmojiService } from '../CustomEmojiService.js';
 import type { ReactionService } from '../ReactionService.js';
 import type { UserEntityService } from './UserEntityService.js';
 import type { DriveFileEntityService } from './DriveFileEntityService.js';
+import type { Config } from '@/config.js';
 
 @Injectable()
 export class NoteEntityService implements OnModuleInit {
@@ -36,6 +37,9 @@ export class NoteEntityService implements OnModuleInit {
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
 
+		@Inject(DI.config)
+		private config: Config,
+
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,
 
@@ -286,7 +290,7 @@ export class NoteEntityService implements OnModuleInit {
 
 		const meId = me ? me.id : null;
 		const note = typeof src === 'object' ? src : await this.notesRepository.findOneOrFail({ where: { id: src }, relations: ['user'] });
-		const host = note.userHost;
+		const host = note.userHost === null ? this.config.host : note.userHost;
 
 		let text = note.text;
 
diff --git a/packages/backend/src/core/entities/UserEntityService.ts b/packages/backend/src/core/entities/UserEntityService.ts
index a339194cc..e1ba71ffd 100644
--- a/packages/backend/src/core/entities/UserEntityService.ts
+++ b/packages/backend/src/core/entities/UserEntityService.ts
@@ -339,6 +339,8 @@ export class UserEntityService implements OnModuleInit {
 
 		const falsy = opts.detail ? false : undefined;
 
+		const checkHost = user.host == null ? this.config.host : user.host;
+
 		const packed = {
 			id: user.id,
 			name: user.name,
@@ -361,7 +363,7 @@ export class UserEntityService implements OnModuleInit {
 			followersCount: followersCount ?? 0,
 			followingCount: followingCount ?? 0,
 			notesCount: user.notesCount,
-			emojis: this.customEmojiService.populateEmojis(user.emojis, user.host),
+			emojis: this.customEmojiService.populateEmojis(user.emojis, checkHost),
 			onlineStatus: this.getOnlineStatus(user),
 			// パフォーマンス上の理由でローカルユーザーのみ
 			badgeRoles: user.host == null ? this.roleService.getUserBadgeRoles(user.id).then(rs => rs.sort((a, b) => b.displayOrder - a.displayOrder).map(r => ({