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Can't really find the reason, the hole on the tube is on the rim side and I can't find anything on the rim bed
Did you definitely orientate the tube the correct way when trying to match it up to the rim? I've definitely accidentally flipped it when trying to line stuff up.
Is the rim tape sunk in to the nipple holes. I've had the same issue in TABR - zero discernable issues other than slight depression of tape into nipple hole but it fucked me on McKenzie Pass.
Update on my Tannus armour inserts. Today I had my first puncture on the front. Can't really find the reason, the hole on the tube is on the rim side and I can't find anything on the rim bed or any cuts or holes on the tyre. The most worrying part is that the insert was covered with rubber shavings that it rubbed off the tyre and the same amount was still in the tyre itself which made the search for a hole quite annoying.
That must rob a lot of energy and I don't know if it will eventually damage the tyre.