ThisHas been fixed in PR github.com/indilib/indi/pull/1296 which got accepted and merged to the master branch today. So expect it in the next INDI update.
Just tested the new 'unattended flip' switch in the mount's driver.
Didn't do a real meridian flip but when pressing the button on the Ekos INDI control panel, the mount correctly reflects the change (see attachment)