It looks like you have something in a transition function or field (provided by an add-on) that is not set up correctly. Could you have a look at all the fields that might be valid for this issue type in this project and check they're all set up ok, then check the validators and post-functions on the "create" transition for setup and errors.
I’m a designer on the Jira team. For a long time, I’ve fielded questions from other designers about how they should be using Jira Software with their design team. I’ve also heard feedback from other ...
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