Restarting is a given and doesn’t make things work.
Pm both a proxmox vm and a fresh install on a pie the results are the same.
install hacs reboot and then add to integrations.
Install a intergration and one of two things happen.
Incase of alexa media player it shows up requesting a restart but after a restart it’s missing from intergrations.
For other intergrations it does not show up after install in hacs and even a restart makes no difference.
Checking custom components shows that it appears to have installed but it doesn’t appear as installed in hacs and either doesn’t show in intergrations or does and doesn’t work.