/plugins/system/helixultimate/overrides/layouts/joomla/form/field/calendar.php
This file conflicts with the Date Picker on EventsCalendar - another vendor.
Spent 3 days talking to them only to find out it's you guys - again.
I have not needed to use a calendar override, so I see no reason it exists. Seems you've just decided to override something when there is no need - again.
I'd also appreciate a real fix to this instead of something that's "just going to get overridden on the next update".