I spent the whole weekend starting and restarting MSFS 2024 with various different configurations, and even activating a flightplan doesn't seem to constantly fix the problem. However, it seems that removing this folder:
\Addon Manager\MSFS\fsdreamteam-gsx-world-of-jetways\LivingWorld_Config
Will make the freeze on the map view when starting a flight way less likely. This is strange, since that file is fairly simple list of vehicles assigned to populate the airport, so it's handled entirely by the sim without any ties to the GSX code, so we'll surely bring it to MS/Asobo attention, since specifying an alternate vehicle Living World file is fully supported in the SDK and there's even a a sample file, which our source 100% complies with.
Removing it will work as a temporary solution, so you won't have to renounce to GSX. The effect of removing it, is that ground vehicles wandering around the airport will be the default ones. There will be zero effect on GSX-proper operations on your own airplane.
In the next update, we'll do this from the installer, which will do that automatically, like in case of the replacement jetways, until a permanent solution (possibly after a sim update that migth make it more stable in general) will be found.