Thread Tittle of the Group's comment section doesn't change after Group Name is changed. [Not a bug]

[HeavenDefyingOtaku]

So, after having a group name changed, the tittle of the thread(comments section) of that said group remains unchanged.
Note: Same applies with the web address of the thread of that said group.
In example, my group.

 

[BraveDude8]

Opengraph images for previews are cached, it'll take a day or so to update. Same applies for manga/chapter threads.