I think the entire OP edge problem can be avoided entirely by only counting the mines in already placed minos (and the edges if there will be any after this comment) only
Currently & theoretically any open edges can be abused to pinpoint mines in a falling mino if you can pay attention to the numbers since each mino has only like 4 spaces (In practice I only managed to abuse the edge 0's to open mino's 0's but imagine if someone with good attention comes by...)