There should be more clear indications as to what (if anything) is going wrong when custom actions are not appearing in the sentence builder or don’t send all the specified fields. Even when following the output fields built-in trigger documentation exactly it will just not work as expected, or at all, without any visibility into what is causing the issue.
Not sure how I’m supposed to figure out what’s going wrong. I have no idea if I’m doing something wrong or if something about your software is unreliable, but either way it’s frustrating to try and guess the magical incantation and pray that the integrations work as expected without any insight into why the issues are occurring.