Hi, I have similar issue.
After update to version 21H1 port replicator stopped to display any monitors. All other functions are working perfectly (USB and network port as well) but no HDMI or DP.
I tried to use older versions of drivers, both DisplayLink and Intel Graphic card. No success.
Strange, isn't it?
HP 250 i7-8565U
Windows Pro v. 10.0.19043
Intel UHD Graphics 620
Alex