Try and video the mis-feed via the action opening, preferably slo-mo.
Not easy with a semi-auto I know!
I suspect the pin is there to keep the follower aligned at a certain angle.
.22LR has quite a steep angle upwards usually to direct the round into the chamber and allow the extractor claw to hook on.
Does withdrawing the bolt slightly when it jams and pushing it forward again, resolve the issue, or does the next round in the magazine push it up too much?
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