Ah, that makes sense. Agreed.
I went for a big jump here and I recall sticking to the wall and doing a separate jump to get out, but maybe it was more of a wall jump. Memory is fuzzy.
Yup - that's the same bug I've encountered. I did not have time to properly solve it during the jam, so I tried to just put the platform a little farther away so that you won't be able to trigger it, but apparently you still can.
I've opened a ticket for myself: https://github.com/idanarye/bevy-tnua/issues/14