Hole in float bowl gasket

[Lorenzo]

I'm recommissioning the GS carbs, and apart from finding loads of tar and almost all the jet orifices clogged, -the emulsion tube had only 1 hole clear out of 15- there is this extra(?) hole in the bowl gasket which correspond to an unidentified passage, maybe a vent, which is present on all but two of the bowls, and blowing it with compressed air, after a spry of carb cleaner, air doesn't seem to come off from anyware.

The fact that upon disassembling the ramp, two of the bowls presented a fair amount of nickel finish, while, the other two were just faded, added to the doubt...

Carbs are BS34SS

Do you know what it might be, shall I just ignore it?

Thanks

IMG_20220211_200918.jpg

[Lorenzo]

Another pic to clarify

IMG_20220211_114339.jpg

Hole in question is bottom right, by the bowl screw.