Went last week but stayed in Vientiane for 2 nights. On the way back only problem was Thai immigration person had clearly an issue with Falang. Make sure your TM is filled out correctly. Otherwise should not be a problem. Hotel reservation and onward travel should be enough.
fortunately I’m still under 50. I’m looking at October to arrive which should have been fairly back to normal but as we see it changes every few days. Will just have to take it as it comes.