fissure no longer causes blocks dependent on the ones below them to fall off, so redstone and torches on the ground are now more or less safe from it. Unfortunately, blocks that depend on walls for support still have a good chance of falling off, and blocks with tile entities will still fall off even if they're on the ground (i.e. signs).
Items dropped by food will sometimes be impossible to pick up.
Summoned wolves will sometimes mysteriously lose their target, basically giving the player an ordinary tamed wolf. The wolf WILL vanish when the target dies anyway, but if the server restarts first, there is basically no difference.
If the server restarts before an item dropped with taunt is retrieved, the person who dropped it can no longer pick it up.
