There is alot of memory leaks in game. Especialy after world upgrade. World was created in 1.18 then upgraded trought versions to 1.19.3 which was leaky in all versions but playable. Then i upgraded world to 1.19.4 and added banners (alot of them) and made 2 armor stands (not alot). I observed my server leaking alot like 40gb per 6 hours. When opened my memory dump file i observed lots of bytes and longs, with references to datafixers so literaly undiagnosable.
Then i went to check my servers ram usage and it was showing 540mb while on task manager server was taking 26gb of ram (using shedoah gc). When switched to default g1c server just dies with 20gb allocated while still showing 540mb usage.