vSphere 6.5 - VM becomes unmanageable after changing the CD device back to host device

[nAFutro]

I am dealing with a issue on my vSphere 6.5 server. After I use a Datastore ISO file and change the CD/DVD Drive 1 back to 'Host device, not connected at power on' the task Reconfig VM directly ends up with "Failed - The operation is not allowed in the current state". After this I can't manage the VM anymore through the webinterface, even the power on function is not working after this.

I have to unregister the VM and re-register it to power it on or edit the settings after this.

The problem is reproducible on my host and occurs with Windows and Linux guests. It happened on a fresh 6.5.0 installation and still is happening on ESXi-6.5.0-4564106

My host doesn't have a cdrom drive, maybe this has something to do with it.

[continuum]

Hi
if your host has no CD-rom using this non-existing device for VMs is asking for trouble.
Why dont you simply keep the working config - just set to "not connected at boot"  or switch to "client device" ?
I assume this behaviour is a flaw in the web-interface - anoying but comparably harmless.