Is the sealing of the underlay membrane correct?

I can't believe that this DIY job with adhesive tape is acceptable. Aren't there any proper, sealed "feed-throughs"? I don't know much about it, but it surprises me.

There are, I have already shown them to the installer, but unfortunately he refuses to use them.

It is actually allowed, judging by the pictures it also looks like various companies created it? Leaks would show up at the latest during the blowdor test.

As far as I know, the blowdor test has nothing to do with the underlay membrane, it only has to keep moisture out from the outside.

well, it is quite normal that slots, cracks, and openings are taped up, isn’t it? After all, these seals also accommodate the movements of the rails/films.

It already exists, I have shown it to the installer as well, but unfortunately he refuses to use them.

Why not, if you pay for them?
In our case, there were collars on the pipe penetrations outside, which were glued onto the underlay membrane.

For the vapor retarder, it would also be good to work with collars on the inside and fasten them with the wonderful Sigaband. Then the blower door test (after screed and window installation). Some use collars, others don’t. If the builder pays the extra cost, that should not be an issue.