We are getting some strange behavior in our topology editing work. When we remove vertices, save and then validate the topology the removed vertices all come back. We have tried in both ArcMap (10.8.1) and Pro (2.8.3) with the same result.
Today, when an editor went in to start work, they are getting this error: Error: Validate Topology failed. A failure was detected inside the topology engine overlay processor. [error id: 135]
I have searched and can't find any information on this particular error ID.
cc @jeffswinney