domain mapping ignores primary domain after update to 4.4.2.1

After updating from 4.4.2.0 to 4.4.2.1 of the domain mapping plugin, the primary domain feature did not work any more. Instead, one of the domains mapped to my site was (randomly?) chosen to be displayed when opening the website.

Thanks for fixing this...

Best,
Wolfgang

PS: I downgraded to version 4.4.2.0 to get back the primary domain feature until the issue is fixed.