Seems like an actual bug that may be related: defended tiles are no longer immune to black market effects (in this case an EMP). Targeted the EMP on orange's pleasure dome and ended up freezing my own too.
Something similar also occurred later that game, with an AI using a slowdown strike on a defended tile and getting through, which you weren't able to do before. That seems like it should stay, though.
EDIT: This was all on next_version
And one more question: is it intentional that claims are now instant or is it a display thing/unintentional? Even for things far away from my base, the moment I start sending the building out, the tile appears as claimed.
While I'm pointing assorted things out, there's an AI chat message that incorrectly uses "Winner's[...]" instead of "Winners[...]"