Dataformfield select: pattern fieldname:key does not display the selected key

Expected behavior:

Add a select field QA with options
OP1
OP2
OP3
Add an aligned view and in the entry template add the pattern
[[QA:key]]
(the template should have both [[QA]] and [[QA:key]])

Go to Browse
Press Add a new entry
A new entry form should open and display one dropdown for the QA field.
Save
An entry is added and displays nothing for the QA field.

Edit the entry
Select OP2
Save
The entry displays OP2 (for [[QA]]) and 2 (for [[QA:key]])