diff --git a/apps/nextjs/src/app/api/user-medias/svg-purify.ts b/apps/nextjs/src/app/api/user-medias/svg-purify.ts
index 06d7d8501..c5237538a 100644
--- a/apps/nextjs/src/app/api/user-medias/svg-purify.ts
+++ b/apps/nextjs/src/app/api/user-medias/svg-purify.ts
@@ -86,8 +86,8 @@ export const sanitizeSvg = (svgText: string) => {
   // linkedom's DOMParser omits html/body for fragment-only SVG; DOMPurify needs a body root.
   const wrapped = `<html><body>${svgText}</body></html>`;
   const sanitized = purify.sanitize(wrapped, svgSanitizeOptions);
-  const svgMatch = sanitized.match(/<svg[\s\S]*<\/svg>/i);
-  return svgMatch ? svgMatch[0] : sanitized;
+  const svgMatch = sanitized.match(/<svg[\s\S]*?(?:<\/svg>|\/>)/i);
+  return svgMatch ? svgMatch[0] : "";
 };
 
 export { svgSanitizeOptions, purify };
diff --git a/packages/api/src/router/group.ts b/packages/api/src/router/group.ts
index 7570a8ee0..0041bce5d 100644
--- a/packages/api/src/router/group.ts
+++ b/packages/api/src/router/group.ts
@@ -327,13 +327,22 @@ export const groupRouter = createTRPCRouter({
       await throwIfGroupNotFoundAsync(ctx.db, input.groupId);
       await throwIfGroupNameIsReservedAsync(ctx.db, input.groupId);
 
+      const group = await ctx.db.query.groups.findFirst({
+        columns: { ownerId: true },
+        where: eq(groups.id, input.groupId),
+      });
+
       await ctx.db
         .update(groups)
         .set({
           ownerId: input.userId,
         })
         .where(eq(groups.id, input.groupId));
+
       invalidateUserCache(input.userId);
+      if (group?.ownerId && group.ownerId !== input.userId) {
+        invalidateUserCache(group.ownerId);
+      }
     }),
   deleteGroup: permissionRequiredProcedure
     .requiresPermission("admin")
diff --git a/packages/next-cache-handler/src/redis-handler.ts b/packages/next-cache-handler/src/redis-handler.ts
index 30415e153..8b02b1e4b 100644
--- a/packages/next-cache-handler/src/redis-handler.ts
+++ b/packages/next-cache-handler/src/redis-handler.ts
@@ -56,6 +56,11 @@ export class RedisCacheHandler implements CacheHandler {
         body: number[];
       };
 
+      if (parsed.expire <= 0) {
+        await this.redis.del(this.entryKey(cacheKey)).catch(() => {});
+        return undefined;
+      }
+
       const allTags = [...parsed.tags, ...softTags];
       const expiration = await this.getExpiration(allTags);
       if (expiration !== 0 && expiration > parsed.timestamp) {
diff --git a/packages/redis/src/lib/memory-channel.ts b/packages/redis/src/lib/memory-channel.ts
index 16975a3bb..34b07d4dd 100644
--- a/packages/redis/src/lib/memory-channel.ts
+++ b/packages/redis/src/lib/memory-channel.ts
@@ -12,7 +12,7 @@ export const memoryPublish = (channel: string, data: unknown) => {
   const serialized = superjson.stringify(data);
   lastData.set(channel, { data: serialized, timestamp: Date.now() });
 
-  // Bounded: evict oldest if over limit
+  // ponytail: FIFO eviction by Map insertion order, not timestamp.
   if (lastData.size > MAX_ENTRIES) {
     const oldest = lastData.keys().next().value;
     if (oldest) lastData.delete(oldest);