When doing lookups with playerlogger (see #2143) posting all the logs into the chat is not really helpful.
Because of that we should provide a client renderer in the way we already do for world edit selections which should render some kind of preview for the lookups.

We might also be able to simply use the same fake-block-packet we already use for /rollback and not even write and client renderer at all.

For now I suggest we implement the second version and if this is not enough, we might be able to extend it with a client renderer.

Well, on my server that I run. /rb does not work at all. (Fastcraft is installed so perhaps that is causing an issue) I will look into this.

As we moved to 1.12.2, is this still an issue? Closing this issue in 7 days if no response @olee @spacebuilder2020

This is a request so it will remain open. That said, /rb is a lot more effective now than it was when this story was created and all that really remains is to create a CUI for RB during the beta polishing stage.

However /rb is for rollback and not for lookup.
So yeah - this feature request should probably be kept open.