I am having this issue as well (3 years later!), but can't seem to find a reliable answer for how to fix.
The Wikitude Cordova plugin should handle this situation just fine. The line that does the trick is this one. Can you make sure that you have this line as well?
Could you also describe how you force landscape orientation?
This fixed it.
I had it before initializing the ArchitectView.
Moved it to after the init and it's working great.
Thanks for your response.