Issue appears on opening a form in edit mode with a record with no value for the combobox.
As defaultselecteditems I add the parent.default to the combobox. This works fine when there is a value, but when the record has no value the defaultselecteditems value becomes "x" and this is set as the selected value.
How should this work:
Record has Value(s) - this is set as defaultselecteditems
Are you sure you're looking at a combobox, with PowerApps autogenerate there wil be normally a Lookup field? And are you sure you have the edit screen, looks like the view screen for me?
I tried to generate a new PowerApp and then add the combobox to the edit screen. Link the combobox to the Parent Update and set parent.default bij DefaultselectedItems. Still the same behaviour when I select an item with no value (the field is not mandatory) for the combobox. I think the combobox sees the value as "" and creates a selected item with a "" value (this is why only a cancel icon is visible.
As I posted is a solution to do an if statement that checks wether the value is not "" and only then do the Parent.Default.