Verified in 5.6.2.0. There is no Cloud Tenant category in 5.6.2.0, so I was only able to verify, that the code was changed.
Sure, but I can't find it in Automate -> Customization -> Buttons.
Created attachment 1203299 [details] custom_buttons
Aah, you're right, the PR adding Cloud Tenants to custom buttons (https://github.com/ManageIQ/manageiq/pull/9561) is darga/no. In that case, the fix indeed does nothing in darga.
I'm closing this BZ as this issue doesn't exist in 5.6.2