I've played every NMS expedition and while there have always been a problem Communication Stations, it wasn't until this latest expedition that I felt like trolling was getting worse.
On the first day of the expedition, I claimed a spot at the 2nd rendezvous system around some Runaway Mould, built a small base, and uploaded it. I slowly kept adding to the base over time, especially once I completed the expedition. So far I've had at least 8 different people build on top of it, which means I have to report their bases just so I can walk around my own. While I've had some people build close to my base, I have never had anyone literally build on the same spot, much less multiple people.
It stinks that Hello Games isn't doing a better job of making sure bases can't overlap, but it stinks even more that people take advantage of it.
Expeditions have way more bugs than standard play, which is a bit of a shame. I had to exit the Fishing expedition because my save file kept freezing, gave up on Expeditions ever since, which sucks since I finished the first twelve.
Keep in mind though, multiple bases built over the same area may not be trolling- other players may not even see your base when they're building theirs, until they log back in to find a base on top of their own; that's what happened to me on Expedition 12