Cannot expand sub-folders after upgrade to vCenter 7.0

Hello,

I upgraded my vCenter 6.7 server to 7.0 and now after the upgrade, I am unable to see VMs in sub-VM folders.

There's the main DC. In that DC, there's a VM folder called Labs. In that folder, there's a folder called Pentest with 4 VMs in it.

I can see the Pentest folder in the Lab folder, but I cannot see any VMs in the Pentest folder.

However, when I click on the folder and then click on VMs, it does show them.

I've attached a screenshot.