fastboot --disable-verification --disable-verity flash vbmeta vbmeta.img
fastboot --disable-verification --disable-verity flash vbmeta_system vbmeta_system.img
fastboot --disable-verification --disable-verity flash vbmeta_vendor vbmeta_vendor.img
...
It works in me
For some reason it didnt for me. I tried flashing in each slot one by one and it works
fastboot --disable-verity --disable-verification flash vbmeta_a vbmeta.img
fastboot --disable-verity --disable-verification flash vbmeta_b vbmeta.img
fastboot --disable-verity --disable-verification flash vbmeta_system_a vbmeta_system.img
fastboot --disable-verity --disable-verification flash vbmeta_system_b vbmeta_system.img
fastboot flash --disable-verity --disable-verification vbmeta_vendor_a vbmeta_vendor.img
fastboot flash --disable-verity --disable-verification vbmeta_vendor_b vbmeta_vendor.img