Columbus Circle 2019 cartridges Gleylancer and 16bit Rhythm Land no longer work under firmware 7.7/7.8

[nihilisation]

Mega Drive Columbus Circle's 2019 cartridge releases "Gleylancer" and "16bit Rhythm Land" no longer work/boot under firmware 7.7 onward. They are working with firmware up to 7.6/4.6 .

Describe the bug: Attempts of booting 2019 "GleyLancer" or "16bit Rhythm land" cartridges give a black screen

To Reproduce: Insert cart, power on, run cart

Firmware version: 7.7 and 7.8, worked fine on 7.6 or "official" 4.6