TV device wall mounting on wood stud wall - How to mount?

Hello everyone,
we want to hang our flat-screen TV in the bedroom on the wall. The space for it is in a corner of the room. Since a corner naturally consists of two walls, I have two walls to choose from to attach the bracket. One of them is an exterior wall.

Now, that wouldn’t be a problem if they were masonry or concrete walls, but we’re talking about timber frame construction. 70mm beams with 19mm chipboard panels and 9mm drywall. And in the exterior wall, of course, there is glass wool and vapor barrier foil. That means if I choose the exterior wall, I must not use screws that are too long and would damage the foil (so a maximum length of 9mm + 19mm). Also, considering the weight, I would need stronger screws.

If I use the other wall, I no longer have the problem with the foil. However, on the other side of that wall, there is already a cabinet hanging, which is already relatively heavy (I’m not sure if that actually matters).

The real problem, however, is my assessment of whether the walls can hold the weight. The bracket weighs 7 kg and the TV 12.5 kg. And of course, the bracket has an approximately 50 cm long arm, which exerts leverage. That makes me a bit uncertain, so I’m asking here.

By the way, I have no idea where the studs are located. Otherwise, I would just screw directly into them.

Maybe you have an idea how to do this best. Maybe with some kind of cavity anchors?

Many kind regards,
Xola

These are normal OSB boards? You can usually hang a lot of weight on them. We have wall cabinets hung here with 4x35 screws and that holds solid. Do you not have an installation layer on the exterior wall?

He did write chipboard. It works, but after repeatedly unfolding it and the associated leverage effect, I think the chipboard around the screw starts to fray and loosen.

And I thought that the exterior walls are probably not chipboard but rather OSB boards. That would be quite unfavorable. You really couldn’t hang anything properly on them.

What has the construction company specified?

Either you find the studs, or you use special cavity anchors that open up behind the panel. Such small screws will never withstand the load permanently. It's no coincidence that the brackets usually come with something like 6x60 bolts. Fischer KD4 should be sufficient in my opinion.

Spax screw into the wall and done.

We were advertised that each screw can hold about 50kg.