Will this support a TV in drywall?

[Hasse C]

In that case, there should be a rule there, which doesn't seem likely since they managed to put a molly plug there?

I agree. At the same time, there won't be a crack in the middle of a gypsum board in that way. That one has arisen from the whole construction moving a little, where there is already a joint or something similar. The person who placed the molly might not be fully aware and has just been instructed to use that plug. Molly plugs work well in wood too, even though they don't expand on the backside as intended.

Regardless, I wouldn't be the least bit afraid to mount a modern TV on a gypsum wall with a molly plug. I believe the safety factor when they say 18 kg is quite high.

 

[useless]

In that case, there should be a stud there, which doesn't seem likely since they managed to get a toggle bolt in there?

If it's a metal stud, there's no problem getting a toggle bolt in there.

 

[Ironside]

Have no experience with steel studs, but they sound entirely possible. In that case, you should easily be able to find it with a metal detector or stud finder if you don't succeed manually.

But if, against all odds, it's a real crack in the construction, I wouldn't trust the Molly spec.

 

[tergo]

If it is a metal stud, then there is no problem getting a molly in place.

It can be an issue; there must be space for the molly to expand at the backside.

 

[Liljeros]

There are probably no major doubts that there are studs in the wall, at least one every 60cm. I would have tried to get at least one screw in it. If you remove the baseboard, you can easily see where the panel joints are since it is usually not fully plastered all the way down.