Can't copy paste keyframes from more than one property within the same layer

AE 26.2.1 and 26.0

MACOS 26.5 (25F71)

This happens when an animated property is added to Essential Properties.

In the original comp, keyframes from several tracks can be copied and pasted in one go.

But when the comp is inside a parent comp, the same keyframes have to be copied and pasted one by one. When several properties’ keyframes are selected, copy paste does nothing.