(Webflow) I do not have time to reliably reproduce... so just fyi / heads up.
I had a div... "top-clientname" and internal text named "top_clientname".
I also have an interaction that controls "top-clientname".
Using the new Navigator rename class feature....
I renamed "top-clientname" to "top-clientname-wrap"
"top_clientname" to "top-clientname".
After renaming both classes... the interaction (which now fails) for (new name) "top-clientname-wrap"
still referenced the old class name "top-clientname".
Also... when you rename the class... the navigator reflects the new name... but you cannot change the name (from the old class) to the new class via interactions.
You have to exit / re-load the designer to see the change(s).
I took this screenshot after changing the Scroll interaction. Both Scroll and Hover target the same element. Notice the named difference.
Here's another interaction (on a different element) that reference the renamed classes (that also failed).
Just found the same issue on another page that references the same class.