Looks broken again today

In the room W12N5, when trying to count how many extensions I have, I got "20" instead of the 19 I could see. To figure out why, I ran this snippet:

var extensions = overmind.room.find(FIND_MY_STRUCTURES, {filter: { structureType: STRUCTURE_EXTENSION }});
for (var k in extensions) {
    console.log(finished[k].id, finished[k].pos.x, finished[k].pos.y);
}

Among all output, I could see this:

558a36c22248e79e5ac9e9cf 13 31
558a36c42248e79e5ac9e9f6 13 31

-> It seems the game thinks I have two distinct extensions, with different ids, on tile (13, 31). When I click on the tile I can only see one.

Same issue here, even with a blank script, when I set something in memory via the console it disappears almost immediately and the memory is reset to { }.