A minor one really.

The horse usually actually has pretty good AI, especially when you're sticking to roads, but just now I broke it. I called my horse, stupidly, while being in a spot the horse couldn't possibly reach. It was a bit above the water, and while normally the horse stops in time so it doesn't fall in, it now slipped or something and fell down into the river. When you manage to get your horse into the water it normally finds it's own way to a part where it can climb out, no matter where that might be, however now it apparently glitched and the poor animal just kept swimming from one side of the river to the other and back endlessly. I tried to push it somewhere else, even tried to use a raft, but no luck. Poor thing, I saved it by reloading the game.

Not yet. The game seems to be very polished. I can see the climbing becoming an issue but thats just an assumption.

I have spent over 50 hours in the game so far; No glitches found (framerate aside).
On another note: you can ride deer.

Least you were able to save it!

I was chasing a boar got close and it just disappeared , same thing happened with a horse, but apart from frame rate that's all .

Same here, happens to me a lot when running away.

I might have just found one. It could be a mechanic the black bokoblins have, but every time I killed them and they dropped their weapons, it just disappeared. Which is really annoying because they use high level weapons, and I hadn't used them before (so they're missing from my encyclopedia).

None for me. Just a few moments of a bit of a drop in the frame rates.

I experienced three shrine related glitches:

Several fully completed shrines did not allow to warp to them unless I manually walked there and activated the door again.

And one Shrine, Mo'a Keet, does not show the 'all chests found' item but the only chest is emptied. I did not read the introductory text in this one and solved it in an unusual way by throwing all the stones to the entrance area using stasis to prevent them from respawning. It took a long time and I died and fell into the lava a lot after collecting the chest, so maybe the tracking got mixed up (the game usually autosaves after opening the last chest). There does not seem to be another chest but the icon on the map does not show up.

And in one of the earlyer shrines the locked door opening animation was shown while walking around. I did not realize how to solve the shrine yet and was surprised because I only was throwing some bombs. But the door stayed closed, somehow just  the animation was triggered. Maybe it was my fault and the mechanics worked correctly, I cannot remember the details.

Im so confused. I thought if anything Docking it would have boosted the System's specs and enabled smoother playing.