I just encountered this as I don't do this often. We had a series of documents (forms) that were set up with a typo (PP10843 vs PP10834) and this became a copy past error for all subsequent forms. This existed as a markup for all forms. So remembering we can search for markups I did that.
I then used the 'Select all' and 'Replace' tools:
I entered in the new value
Nothing happened. I think this used to work in the past though. I don't use this regularly enough to remember if it was functional in previous versions.