Just an update that the issue with USB (in both the installer and the installed system in general) persists with u-boot-rpiarm64-2020.10-10.1 and kernel-default 5.10.9-1.1 which were both released with snapshot 20210122. Currently I'm running on 20210122 with all the updates except for the kernel. I'm using kernel-default 5.9.14-1.1 instead of 5.10.x and everything works as expected.