Changes to server_collation on aurora mysql8 instance is not applied

Hi

When changing collation_server on a 8.0.mysql_aurora.3.01.0 DB cluster it seems like the change is not applied to existing clusters but only new ones.

A custom DB cluster parameter group was created with collation_server=utf8_bin and a cluster was created using it. Later we changed to collation_server=utf8mb4_bin but the cluster now reports collation_server=utf8mb4_0900_ai_ci when executing show variables like 'c%_server' (also confirmed that when you run create database test it gets the wrong collation).

It seems like it is only related to collation_server, the value of character_set_database seems to get applied correctly.

If I create a new cluster using the updated parameter group it works as expected

Can anyone reproduce / confirm this?

Best regards Jens