i think the core is more or less a mixup or not comparable to any standalone version ,
it has really old bubs like you said but is has vulkan so its kinda strange , or since when had standalone vulkan ?.
still the core “works” for most game didn´t testet 1080 S …but i get rid of sunshines “pixel/square puddles” can boot up project M and also i got mega man 9/10 running saddly none other wiiware like castlevania rebirth ^^
and i must say i had less problems with paper mario ttyd with the core than with standalone fore some reason
But… yeah it´s a mess what i ended up with , cuz i added some newer dolphin standalone files to the system folder myself and changed some off the configs
still 007 Nightfire , NFSU 2 and other EA games have buggy videos
an update would be nice anyways for so many reasons