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It's cos the bead isn't flat and that makes it wider than the straight wall to wall measurement.
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I had that problem before, what happened is when the tire dropped to the central ridge the tape, as it's not very flexible, lifted from the sides. As you pump the tire it will move to the rim walls, pushing the tape back into place. If the tape is too small it may not get trapped between tire and rim, and air could slid under making the whole operation fail.
pit
Netakure
@tallsam
I read that you're supposed to use tubeless tape that is a bit wider than the rim internal width. Is this so the bead sits on the tape?
https://www.velocipedesalon.com/forum/f40/how-tubeless-rim-tape-install-45115.html
I've stupidly not read this before buying some tape. I have 23mm tape and 23mm rims. Do I need to reorder tape around 26mm? Still waiting for my valves to arrive and haven't got a tubeless pump or any fluid so no rush.