MCMT (compiled newest version) works fine with either Sodiumforge or Starlight but causes crashes or stops the server from ticking when all three are installed. Sodiumforge and Starlight dont cause crashes with only them installed.

The following MCMT configs have been changed to prevent the server from freezing and stop ticking
disableWorld = true
disableWorldPostTick = false

Logs here
https://gist.github.com/ShroudedGuise/c6550361a7d271cefc32f7aef2e0b267

Just off of memory; aren't Sodium and Starlight both incompatible because they make their own changes to the lighting engine?

Apparently because Phosphor only changes the vanilla lighting engine and Starlight bypasses it entirely they don't cause issues. However I have also since realised that this issue only affects singleplayer, as there is no need for a client or server to run all three mods at the same time.