Hi,
Sorry, I didn’t found the time to record anything. I tried to reproduce on clean install.
The only way I had the bug was plugin installed with composer, on a multisite install, and plugin inside mu-plugins, so autoloaded on a network. Using roots Bedrock for composer. Doing the same on a Non-Network website the “bug” does not occured.
So I installed it in classic plugin folder and enabled it in the Network, and now it’s working fine.