A handful of plugins rescanned every start up

I am evaluating the Synfire demo and am seeing a possible issue with Synfire 2 (latest build as of last night) where it seems to scan/rescan some, but not all plugins on every start up.

In addition, I've noticed that that the scan seems to flip flop between the same few VSTs / VST3s. So on one start it will do VSTs and then the next it will do VST3s, starting the app again, it will go back to VSTs. 

I repeated this behaviour quite a few times last night trying to work things out but didn't get very far. Any logs I can check or any idea what might be the cause?

I'm running Windows 11 and have tried checking other related posts around rescanning etc. 

Thanks in advance.