BBS Triton rims second hole

Greetings. I would have a special question and to those with Tritron rims. I picked up my Triton rims from the rim doc recently and I only got to go to the tyre dealer today for the assembly. Already with the first rim (accidentally exactly the one) there was a problem when pumping the tires. It was not because the air blew out at the ring and apparently is not dense? When looking more closely then we noticed that the Triton rim has a second hole below (s There the air escapes and blows out just above the ring?! With another rim this hole seems to be somehow closed (Like a coin??) The tyre dealer also said he sees something like this for the first time but he thought that too much air escapes through the hole and can not be held by the ring because of the high pressure? I must probably the days again to the rim doc but would like to know what it has to do with this hole. I forgot to take a photo of the closed hole at the other rim. I also find the recess around the hole strange and what it should serve.