Find Marked Frame by Frame Number doesn't seem to work properly

Just for documentation sake, because it isn’t in the actual documentation.

“Find Marked Frame by Frame Number” appears to return an index instead of a frame number.
-1 is not found, and 1 is Marked Frame 1 in the sequence.
You can use the index with the array output from “Get Marked Frames”.

(as of Unreal 5.2.1, I haven’t checked others)

For more context, see my response here