Details wanted for "Mismatched entity and/or field definitions" message on custom field

I have developed a custom Drupal field.

All works fine. We are already using the field in production for a year. But the status report for exactly this field says:

Mismatched entity and/or field definitions

I would like to get rid of that message. It gives me a bad feeling about the reliability of my Drupal installation.

I could write an update hook if I knew in detail what is wrong.

How can I find out what exactly does not match?

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Details wanted for "Mismatched entity and/or field definitions" message on custom field

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