Hello,
I have the same problem since version 29 on a RPI 3B+ on microsd.
Did not work at all for every games of every systems i have tested (nes, snes, genesis, mastersystem, neogeo, cps-I, cps-II, cps-III, taito, n64 and so on).
It was working correctly with 5.27.
Same problem with 2 differents RPI3B+.