Property mode="modal" not working on real device!

Property mode="modal" works perfectly well on android emulator but not working on real device or production! Tested on android LGk41S - Android 11.
On real device it works as if the mode property wasn't called. It has no effect! Expecting the modal dialog box as it is on emulator, but that's not the case for real device as the modal dialog box does not pop up at all.