Yes I did the same update yesterday to revamp but still had the 20% issue but I was reading through the steam discussions this morning and someone mentioned the problem is with revamp despite the update to it yesterday so I removed all revamp mods and then installed the 1.13.1.0 patch and went to load my american farmlands map expecting it to freeze at 20% but it did not it loaded no problem at all so the issue appears to be with revamp despite the update to revamp yesterday to fix a bug with the patch.
So if you have any revamp related mods installed then remove them and see if it works for you on the latest game patch.