MIDI Keyboard Input not working when Playback is disabled

MIDI Input does not work when Playback is disabled. (the big power button off)
I have set Dorico to disable Playback when opening projects. This way, I can make changes without loading instruments to RAM.
MIDI Input not being available makes workflow slower in my case.
Its intended behaviour, a bug or I am doing something wrong?

Is anyone with the same issue?

Yes, I see this.

As a workaround you can load the “silence” playback template, which doesn’t load any instruments and let’s you activate the playback for the project.

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But loading any playback template deletes Mixer settings, which is also weird behaviour.