Table View > Headers ignore Display Name expression and show column name instead

[pawann]

I’m facing a rather strange behaviour of a Table View in one of my recently created apps:

Table Headers display the column name despite expressions for the columns’ Display Name are set.

In another app created previously using the same account, the values calculated by the Display Name expression are correctly used for the table headers instead.

Settings for both apps are claimed to be identical.
Testing the simple Display Name expression yields expected output.

In addition, Display Name expressions work in Details View and Form View, but also not in Inline View.

Now, what am I missing here?

Table View ignoring Display Name in table headers:

Table View correctly using Display Name in table headers: