Weekly vault in LoR reset to bronze from Diamond

Seems to have happened to a few people. Summary:

1. I wake up on Tuesday and look at my boxes
2. I see 3 chests with a distinct bronze colour
3. I click open and it opens them for some pretty mediocre rewards?

I made a thread and some users seems to have experienced it too:

https://old.reddit.com/r/LegendsOfRuneterra/comments/ev5999/did_anyone_else_a_diamond_chests_become_bronze/