Spacebar is per default assigned to "Transport: Play/Stop". Still means that it should stop and go out of record mode when you hit it. I really don't know what might be happening there, sorry.
There is an SWS extension action called "SWS: Transport: Record/stop" are you talking about that one in the OP?
In your screenshot you assigned yet another (custom) action. Maybe that custom action is borked?
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