Hey Yuri,
I’m still a beginner at C++ but I’ve decided I’m going try and solve for this issue myself on top of your patch because I care enough about it making it into 4.21,and realize they might not get around to testing it due to the 4 lighthouses setup being uncommon. I think this issue should just be a simple order of serialization thing since it is only crashing when the 3rd and 4th lighthouses are turned on before the trackers. Of course to even have more than 5 devices working without crash I am starting with your patch so I’ll need to make the edits on top of the patch. I’m not sure where to start with modifying a plugin since I’ve really only worked within the project classes so far with C++. If you have any high level, overview steps for me getting started with plugin dev, making edits on top of your patch, or any tips on things to try to narrow down the issue it’d be a huge help.