I have upgraded an TYPO3 project from 7.6 to 8.7. Everything worked fine as far as I can tell.
Now I upgraded the powermail extension to the latest version and noticed that the form data is not "complete". I the frontend nearly everywhere it shows "no form to show". I the original TYPO3 instance we have 41 forms, in the dev project we only have 5 forms (in BE list and BE powermail form oveview) with different site and field counts than in the original 7.6 project. But when I check that in phpMyAdmin the tables are exact the same – all forms and fields are in the DB table. Also did a fresh import of the powermail tables – nothing changed.
Any idea why powermail does not show some of the forms?