I got matched to UA Silver back when there was short window when regular Marriott Platinums could get matched. That status expired yesterday, and I didn't realize the sweep had occurred before then. I did confirm I'm now LT Plat Premier Elite (which I guess is a short LT since it shortly becomes LT Titanium Elite) which then let me cross match back to UA. It wasn't instantaneous back to UA Silver but hopefully updates my account back to Silver in a bit.