Hey, thanx for making the dream of physical keyboards on smartphones once again come true.
I couldn't help but notice, using the google-calendar in landscape is fine, until you create or edit an appointment, the display picture then flips in vertical mode (physical keyboard still deployed).
And it happens either in auto-mode, as well as in manual rotation mode.
(As a small reference the old Droid4 with a Lineage OS, doesn't flip.)
Cheers!