We just highlight a relationship with (previous) pending edits in orange when loading the relationship editor, but that's not super clear, especially since we also use orange highlights for actual edits made while using the relationship editor. The fact the relationship has pending edits is shown once the user opens the "edit relationship" popup, but they might never do that (for example, they might just remove the relationship with one click).

We should have a more clear indicator. My suggestion is to add a warning sign, which on hover could have the same sort of message as we now show when editing the relationship - including the link to the edit search that allows seeing what those pending edits are, which is super useful.