Previously when merging contacts, we could see which account each contact was set to. This functionality has now been removed which makes merging contacts who are the same person difficult when we can't see which company they belong to.

Can this please be introduced again for contact and account merging (that is, parentaccountid on account, and parentcustomerid on contact being available on the merge dialogue with selector for account to use).

Note - this is based on a response from Microsoft support which states (see highlighted):

If a control / field matches any of the following conditions, it will not show up in merge dialog:

The field of both records are empty

The containing section is invisible in form descriptor / form xml regardless whether the section actually shows up in runtime (it's possible to show via client API) - you can find it out on form designer

The control does not have a classid property - you can find it from form xml

The attribute's metadata ValidForUpdate is false - you can check it out on Unify

The control is QuickFormCollectionControl or ReferencePanelQuickFormCollectionControl

The attribute is Picklist or MultiSelectPickList and it has either a parent picklist or child picklist attribute

The attribute is parentaccountid on account - this is hardcoded behavior

The attribute is parentcustomerid on contact - this is hardcoded behavior

The attribute is ownerid 

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