Full Keyboard Access

Check further into your Accessibility settings, there may be place where you can deactivate the special function given to Space.

You can liberate Space from that function and use something else instead by editing the commands in settings:

Thanks. A simple way solves the messy space key: Go to Accessibility and turn off “full keyboard” - then the space key functions again as intended.

Mogens Kuehn Pedersen wrote:

A simple way solves the messy space key: Go to Accessibility and turn off “full keyboard”

Of course that will do it. But you don't have to give up controlling the iPad from your keyboard in order to have your Space key back: You just change the shortcut for Activate from Space to something else.

Yes, you should switch off full key board access in accessibility settings. Then Apple key board works fine in iPad Pro 11".