Disappearing "chat" messages to teammates.

31/01/25 13:21
I posted a pre GC message to my guild this morning ( approx 08:00 GMT) it was posted and read by a few. It has now been removed/deleted or censored. Who could have done this and why? It wasn't offensive or is there restriction involving length, time or any other reason for this?
31/01/25 16:30
Chats and messages sent within a few hours of switch over are always removed when they regenerate the new championships it's happened every season for as long as ive been on the game