Dynamic hostpool scaling not working

We have set up an AVD dynamic host pool for testing.

The scaling plan properly ensures that a host is created when needed. However, the host is no longer removed even after the rampdown.

We observe that the total sessions counter gets stuck.

If I log in with a user and then log out properly, the current sessions in the host pool overview are updated quickly. But, if I then go to Manage, Session Hosts, the total sessions on that host remain at 1. Only when I put the host in drain mode are the actual sessions updated.

Still hosts are not removed.

Anyone seen this before?