Expression page not show up in read-only version

[Swoopy]

Sometimes we need to check/copy/track/etc. the expressions saved in the previous versions of our apps. On my app's (UX) editor (shown in this image), I can only view the expression of "Show if" but not "Display name" (there's no the popup expression page shown up like in the "Show if" case).

Is this only happening to me?