I noticed this while executing https://jira.it.epicgames.net/browse/UEQATC-1441. At step 10, there should be warnings on the nodes that were updated by the HotReload.
This is a regression from 4.13.2. I checked 4.13.2 binary @ CL 3165739.
There are no warnings generated on the nodes that were impacted by the Hotreload.
Warnings are generated on the nodes impacted by the HotReload.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-37608 in the post.