Directory is not seen

Since going to 20.04 I have been seeing some odd behaviors.

Thunar is not seeing Maxtor_SDB1. What is shown on the right side is actually the contents of
Maxtor_SDA2.

How can I fix?

Don't have Thunar but if you have Caja does it show correctly?

When I rebooted, it is working again. ??

Strange.