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Replicate

Replicate the bug in your local environment.

Check

Check - do you have the latest version of the contrib module?  In case the issue has already been identified and resolved.

A quick check of the issue list for the contrib module.

Nothing.

Document notes

Read through the log files to understand where the bug is located.  Devel module is a must for a backend dev to help resolve issues like this one.  Ensure Symfony var-dumper or Kint is running.  Data is gold here and a time saver.
Armed with data, you will have a great idea of what has gone wrong - so time to fix the bug.

Test.  Test.  Test.

All working... Create a patch so any future updates don't have the same issue.  Also, let the contrib module authors know about the issue via normal git processes.