Was running Fusion 11.5.3 on Catalina 10.15.4 with no issues. Upgraded to Fusion 11.5.5 and could no longer forward/mount USB drives in Win10 guest.
- Upgraded the Win10 VM to May 2020 update, did not resolve the issue.
- Upgraded Catalina to 10.15.5, did not resolve the issue.
- Removed/reinstalled VMware tools, did not resolve the issue.
- Downgraded to Fusion 11.5.3 and can finally mount USB drives again.
I plan to stick with 11.5.3 for a long time, until release notes in a future version specifically address this issue.