Whenever you do things like place/break blocks or take damage, there is a chance for a scent marker to be placed on that block/yourself. This scent has a hitbox that can and will collide with the player, its more similar to pushing the player away or when a phantom block is present as you can go through it but next server tick you'll be pushed back to where you were.

You probably have/need a single line of code that breaks/fixes this issue. But currently the mod is unplayable while it is present.

I know it is the scent markers cause I caught a glimpse of the scent being picked up by jade where a problem spot was located

@3th3
#135 (comment)