VMware Has released a new build of Horizon View. This is a bug fixes version.
Fixed in this version
Instant-clone operations fail with Horizon 7 version 7.3.1 or version 7.3 while connecting to vCenter Server in some situations. This failure can have significant consequences in production and is now handled gracefully in Horizon 7 version 7.3.2.
Here is the release notes: https://docs.vmware.com/en/VMware-Horizon-7/7.3/rn/horizon-73-view-release-notes.html