I had a look at this on my tavor and noticed 2 things:
1. Pmags don't cause the exact same problem shown in the video since the tavor bolt hold open is in the center of the mag.
2. With 1 only one round left in the mag, the follower is what's pushing up the bolt hold open. It causes it to protrude slightly above the aluminum receiver. I tested Pmag, 10 round LAR, generic AR-15 steel 30 rounder. The only ones that do not have any protrusion are the IWI mags.
I don't think the problem in #2 is as severe as what the OP is reporting, but I am concerned that only the IWI mags definately do not cause the bolt hold open to protrude in any case.
Can anyobody else confirm this?