Individual selection of motors with E + [ 1 | 2 | 3 | 4 ] key does not work

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In the cabin of a twin engine, I cannot select engine 1 or 2 to individually adjust the mixture or propeller pitch or power.
The keyboard sequence “E + 1” or “E + 2” does not work.

Select any twin-engine aircraft
Start both engines
Press the “E” key followed by the “1” key
Press the “F3” keys to increase the power of engine 1
ERROR: the power of the two motors is increased

Build Version # when you first started experiencing this issue: 1.15.8.0

I use the Steam version

Did you submit this to Zendesk? If so, what is your ticket #?: NO

I have the same issue. Tested in default Baron 58, no peripherals. Zendesk ticket #129203

1 year later - still not fixed! the “select engine” key command “E” key does not work