It should work without any changes, but we still need to verify it before release.

Trigger Reactor is working fine on real 1.18.1 server.
(When asking about 1.18.1 support in other people's QnA's, it seems that there were no compatibility issues other than JShader issues.)

working on 1.18.1 Paper 136.
repeat Trigger is working, Negative Y Trigger(ex: Area, Click, Walk...) working.