Hi, I'm not playing Sims 4 that long but i alrdy wrote Bugreports about Sims 3 🙂
Maybe i can help you:
As i understand the Bug right, it starts with the FIRST weekly market from cottage living.
So when you make a new Character you need to build the rocket BEFORE the first weekly market starts, so you can use & upgrade it still after the first market.
Whenever i didnt build it instant i wasnt able to build the rocket at all, also aksing others to build or using cheats wasnt possible.
I tried it a couple of times and it worked out for me: Just build it kinda instant. (You can ask other sims to help and boost the placeproperties to speed it up abit)
You can also make a Park for Rockets or take one from Gallery if you dont want it at your home. (Just make sure the one from gallery is ok, the one i took had no door and it took some time until i figured out why i wasnt able to join the place ^^)
Moreover: City Living:!
Just got this pack and there is an Event "Geekon" where rockets are spawning which you can use without any bugs
I hope this can solve some problems 🙂
And if you got questions you can just dm me ! I've met alot of bugs and mostly was able to fix it by myself (simply by gamesettings, cache etc, NO mods!)
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! I'm playing on PC, not using any Mods, some Cheats might can clear bugs or you can just clear some cache files from time to time ^_° !