Velocityone Flightstick buttons 7 & 8 not working or being detected/recognised in MSFS on XBox Series X

I also cannot get B7 and B8 working with MSFS, even if I try to do a custom mapping. B5 and B6 do work. Is this still expected? It seems weird that the default V1 mappings in MSFS show B7 and B8 even though those two buttons don’t work.

What am I missing? Is my joystick defective?