After updating to the newest server files, there was an issue where the client would crash to desktop within a few seconds of loading the world. Later this was determined to be caused by the creative mode's flight, as walking normally on surfaces does not lead to a crash.

The bug appears to be on the server level, as the crash is reproducible on both desktop (Windows 10) and mobile (Android) clients, both fully updated. Each client is able to operate flight in creative mode in their own worlds and only appear to crash when flying in the dedicated bedrock server.

On the server side, it is reported only as the player disconnecting from the server.