Helloo so i was having this crash on my server (Fabric 1.19.2). I was working on my modpack for SMP... I tried fixing myself Removed "BaseFireBlockMixin" from 'vc_gliders-common.mixins.json' and it fixed the crash on the server. Have a look at the crash log... Hope that helps:
Gliders Crash.txt

2. There's also an Exploit.. When in Air if you spam Space it puts you in creative flight in survival.
   (https://user-images.githubusercontent.com/75019293/220634288-23a8b9fa-eed2-4d6d-b358-e537e4f2f259.mp4)

Are you saying the crash persists after removing the mixin entry? As, if it doesn’t persist after the entry is removed this becomes a duplicate of #3

The flying is already resolved :)

Yeah it worked for me after removing BaseFireBlockMixin. Before that server wasn't starting. Singleplayer was working fine for me but server had crashes.

This issue has been resolved for 1.0.1