Text stack, find/change not working

I think I have faced this issue before, and it seems to be occurring again.

I am trying to search a text Stack text field for a string of text to update.
Either it is greyed out, or when it shows under the menu, nothing happens.
It seems to be confined to text within a Stack.

Or… does find/change simply not work within a text stack?

Nevermind, I found my old support notes for this issue. It seems that find/change does not work within a text stack.