I've opened a few worlds to test this out and in all of them I can place the rings in any trinket slots. Shift click doesn't do anything and manually trying to place it wont work either.
Hello, i'm not able to replicate the issue. Can you replicate this with only Trinkets, Rings of Ascension and Fabric API installed?
I think it is a mod incompatibility
I've opened a few worlds to test this out and in all of them I can place the rings in any trinket slots. Shift click doesn't do anything and manually trying to place it wont work either.