sandisk SD card error with 9.0 roms

Been flashing some of the roms for the V30 recently to see how they were and have been getting a “issue with SanDisk SD card” which would lead to having to format my sd card in order to use it as extra phone storage or portable storage, and have been wondering is this just a thing with 9.0 and sd cards in general or the roms? phone i have is US998 and the roms I’ve been flashing have been LineageOS 16.0 [Unofficial] and Dot OS 3.0.

Hi @BenFusco
Have you opened a Support Case? If not opened, for more information, please contact the SD Technical Support team for best assistance and troubleshooting:

I think there could be a compatibility issue with the ROMs you’re flashing, problems with the SD card itself, or how the SD card is formatted. Diagnose the SD card with the chkdsk tool, or if data is no problem, try to reformat it. Check if the SD card works correctly with the stock firmware or another device. This will help you find the issue is with the card or the ROM.