Small Z gap support

Trying to print a captive hinge, but I can’t get the Bambu Lab software to put a support under the pivot point. The gap is 0.3mm. I’ve printed the same part using other machines and slicers no problem. Would like to know how to get it to do it in the Bambu Lab slicer.

Tried to paint them but when sliced they don’t appear. I assume something is overriding it. I’ve tried all the preset 0.08, 0.16 and 0.20 slicing settings but with painted supports where I want them. Also tried changing the Z gap to as low as 0.01mm.

TIA