I'm glad to hear that you fixed it, so I will go ahead a and lock this up for you.
As for the issue with the particles, we do not really no why exactly they duplicate- sometimes they do, sometimes they don't, and sometimes more often for specific users. It can be a tricky thing since they aren't always causing the issue, but usually they are one of the most common issues with crashing maps. This was an issue before the update, and is not caused entirely by the update. For the most part, map-making should work pretty much the same after the update as they did before the patch. I do believe there are a few map/map trouble tutorials out there that can still be useful to mapmakers after the patch, which can help most issues that mapmakers are experiencing. c: