Encountered in 1.14.3 while loading in the Nether.
I'm experiencing this same issue. Especially annoying when I'm breaking a bunch of blocks and they keep appearing again.
Are you a bot or is your English very poor?
Experienced this problem with a tamed horse in 1.14.2. I dismounted it, took a second of suffocation damage due to blocks on either side of me, and the horse was gone. I could hear it neighing but could not see nor its hitbox. I had to exit the world and reload it for the horse to appear again.
I'm having a similar issue that I've submitted yesterday. Patrols are able to see me from incredible distances, and potentially even through blocks.
Maybe if they had a range similar to zombies I could accept that, but this is kind of ridiculous especially with the seeing through blocks ability/bug.
I think that's intended so you can continue it if you want. Annoying, but yeah, just make sure you stock up on milk...
My village is also desolate after just a few in-game days, though I assume the issue is simply zombie sieges being left unattended to?
I hate the mechanic myself, the fact that there's no way to prevent them (since they spawn in any amount of light and inside the village itself) doesn't make sense to me in the context of the rest of the game, personally. But enough ranting...
It's possible a siege (or multiple) wiped out your village and those villagers you found had been chased away and managed to survive due to being far enough away.
I haven't tried building a golem yet myself, but that does sound like a weird bug. Are you sure you are using a carved pumpkin and not a regular pumpkin? Because it does not work with a regular pumpkin, just a carved one or a jack-o-lantern.
Single player, I do experience lag at times.