I played this game 2 years ago and ended up quitting the game because I bought my 20M gold island and it was subsequently unusable. I've recently returned to the game because I remembered liking it and had forgotten about the bug, but despite all the game updates since I stopped playing, my account is still broken.
The next island I can purchase is the 50M island. The 20M island is cleared of all obstacles and is no longer showing a "For Sale" sign on it, but no existing structures can be placed there. I tried logging in from an AOS and IOS device and the problem is the same on both. This really puts a damper on end game progression. I suppose I can save up for the 50M island and get expansion space that way, but long-term I'll be robbed of an entire island if I can't get this fixed which seems like a pretty big deal.