4 spd. pops out of gear.

Well out on the bench with cover off I see no obvious damage, but I have an un trained eye.
would these 1-2 slider pics offer any clue to what`s going on? What say you builders?
IMG_20200122_174642.jpg

The only obvious wear I see is on the 1-2 fork.
IMG_20200122_174349.jpg

I can try and get additional pics if needed just ask what with detail.