Others also experienced the entire tower dissappear, I don't know if that is an event or not, because I didn't had it dissappear myself yet, but it seem to happen at the same time as it loses connection
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The treehouse appearing earlier is just a change, developer made it that all the events happen much more earlier, I think even the big pyramid appears on day 35 instead of 42, and I got the first triangle ship signal on day 7 instead of day 14 or 15