How do you set Manual power type?

I just setup MAAS 2.6.0 and am trying to set a Machine’s power configuration to Manual but the Save changes button is grayed out. Is this a bug or am I missing something?

I have the same issue with MAAS 2.6.0 on Ubuntu 18.04. I used cli to achieve.

I found another workaround.
I first changed the power type to APC and saved it and then I was able to change it to Manual.

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This is a known issue, reported here: