Here's a short video showing how mobs no longer see signs and fence gates as solid blocks, and therefore will not path off of cliffs if signs and fence gates are placed on the edge of large drops. It has implications for certain mob farming setups.
You are correct, trap doors do seem to still work. However, there is a still a problem where you cannot create a gap wider than 2 blocks that a mob will willingly walk off. Open trap doors, like signs and open fence gates, do not stop a mob from spawning in the same block, so I suppose they can work as a stopgap for some applications. There are very specific things that won't be possible anymore.
there's still always the piston and pressure plate set-ups. they take longer to build, but the advantage is that they tend not to get "broken" by updates. so its worth the extra materials and effort. a lava blade that you can toggle on and off is also a good feature to add for xp farming.
i try to keep water, signs, fence gates etc. out of my traps as much as possible for this reason.
My mob trap that I've been building uses water, but it actively floods the spawning zones periodically, rather than relying on mobs to just fall into the water.
My mob farm from early beta that relies on falling still seems to work, not sure how though... I'll have to watch the mobs and see what's going on here.
That's good. I guess people who relying on them to fall, needs to reconstruct theirs now. I don't use Traps, but I have seen lot of people use them like this.
there's still always the piston and pressure plate set-ups. they take longer to build, but the advantage is that they tend not to get "broken" by updates. so its worth the extra materials and effort. a lava blade that you can toggle on and off is also a good feature to add for xp farming.
i try to keep water, signs, fence gates etc. out of my traps as much as possible for this reason.
Huh no. My mobtrap still work perfectly fine.
I don't see why a solid block wouldn't work. It's the water that they are willing to jump into.