ERRORs after module uninstall

Hi, same here, needed to reinstall whole system.

Same problem. Once you uninstall, and you visit the variation page where the trait was turned on, you get this error.

[The first time I tried it, it actally came up but the trait was still shown with the value grayed out, even though the module was no longer there. Second time I installed/uninstalled got this error. ]

I tried
- drush cache clear,
- truncating the DB table "cache_recovery" (this is rebuilt after cache_clear),
but problem still exists.

This commerce module had a similar problem, and somebody wrote a long hook_uninstall patch, that checks and clears the traits.
https://www.drupal.org/files/issues/2906694-uninstall-traits-5.patch →
I have not tried doing something like this, but this module may need something similar.

For us, we decided not to install this module on production, but write a custom solution.

I found a temporary workaround, until this is fixed for real.

The trait is recorded in the config for the product_variation (but never flushed upon uninstall)
The steps are:
1) export single config (for example using the config-export interface)
2) edit it,
3) re-import it.

Here is the config for the product_variation that has the trait, this is left after uninstall:
traits:
- maximum_order_quantity
...
.... [ it may have more, depending how you configured it, in our case we only had maximum ]

Here is what the line should read after you edit it, assuming there are no other traits from some other module that you need:
traits: { }

After the re-import the system works normally again.

The real solution would be to flush the config upon uninstall in hook_uninstall