The game crashed whilst ticking entity Error: java.lang.ClassFormatError: Method a in class brs$a has illegal modifiers: 0x8

I was playing in a Hardcore world on the latest snapshot 24w20a, I entered a trial chamber, drank an Ominous Potion and started to fight the Stray's that spawned from an Omnious Trail Spawner. As I'm fighting them, my game crashes with this error: 
The game crashed whilst ticking entity
Error: java.lang.ClassFormatError: Method a in class brs$a has illegal modifiers: 0x8

I cannot even load into that world anymore, it will get to 100%, then crash with this error. 

 

Please see the attached crash report for troubleshooting.