Server instance getting stuck, when binary is not able to run.

[InflamedSebi]

To elaborate, a server instance can become stuck, in a manner, that will allow buttons pressed in the UI and does (to some degree) still does respond to the console, but not do anything in the background at all.
This behavior is only limited to the instance in question and all others will continue to work as expected.
Pressing a button on a stuck instance in the logs:

A stuck server instance can (only) be recovered by completely restarting the pufferpanel.service, thus stopping all instances, which is quite inconvenient.

What gets a server instance stuck?
There is one general way I encountered and it can be reproduced by executing a binary it cannot start/find.
For example a missing execute permission on a binary when starting a server (current valheim modded template breaks on server start since binary is not set as executable after install) or if the binary is non existent (custom template of mine had a typo in a path to the installer, so it got stuck during install).