Hi there,
OK , so then that makes sense plenty of sram, I find this from the wiki
microSD card slot on Round Display, the chip select pin should be D2
D8,D9,D10 are the SPI port portion Can you check the D2 line with meter or If you have a PPK2 use the logic analyzer probes.
Have you tried and earlier version of the BSP instead of 3.6.3 ?
HTH
GL
PJ
.