Unable to jump when up against a block

It's not just walking forward, it is also backwards and sideways. Even diagonal.

Also mobs can't jump when touching the block.

And when going down on stairs you sometimes are hovering above the block. It seems that the block-hitbox is off somewhere....

And this makes it very unplayable. I hope this will get fixed and not left like the enormous lag-problem that the snapshots currently have (that makes it also almost unplayable). 

Probably came about from the "improved" collision code that was mentioned in the snapshot article.

Some improvements & functionalities were mentioned in the article; But don't people check to see if the update actually causes something else... Like Another obvious Bug??? Mojang?? Really?

EDIT: It is a snapshot... OK... the Team cannot correct every bug, but I am certain that they must correct some of these before releasing... or it won't make sense adding anything to the game at all.

This happens al the time, it's no big deal. This is why we are here testing the game after all, so that they don't have to all the time.

I am also very disappointed by the workflow of this game at the moment. Every last snapshot had a tiny amount of content and 10 new bugs with it, sometimes major ones, where you really have to ask yourself if people test this before release, that's what I mean by workflow. I think it's okay to criticise the developers sometimes. I hope they don't take it personally, but they sometimes just don't do a great job. This one bug is so major that the fun I usually have with MC is going to 0.

Experiencing the same bug. Running ubuntu 18.04 lts with  openjdk 10.0.2.

same here under windows 10 with shipped java.

Auto-jump allows to jump but in weird ways (going front allows 2 jumps when they're not too close, when going down the avatar sometime jumps, jump is ok when using the side of the avatar ...)

Same problem here, (though I don't have an issue when in water) and when running, if you touch the side of a block, it slows you to a walk. Also, as far as auto-jump is concerned, it works, but barely. If you end up pressed up against a block, it doesn't work. (Maybe this is how it always is, I don't use auto-jump because I find it annoying, lol!)

It also happens when pressing backward while leaning against a block

I went into the nether and got some blaze powder from a nether fortress. I then had to get one more block of obisidian to craft an ender chest because I only had 7, so I went down to my obsidian mine. Unfortunately I had to run back up and get a water bucket because I had forgotten it at my nether portal. So after I had that, I got the obsidian and made my first ender chest.

Point is: this bug is very annoying but it's not "unplayable". Make some stairs, jump earlier, use ladders, whatever. You can work around it until it gets fixed which will surely be soon. This is a snapshot after all.

The important thing is that our worlds aren't corrupted. Our saves aren't damaged. Imagine if that happened to you.

So, gain some perspective and stop whining about every little thing. I have waited and am still waiting for years for some bugs to get fixed (like leads breaking, water flowing bugs). This is peanuts!

Hey Hawk J, I don't think you have the right to say what is peanuts or not to others. I play this game since early beta (with breaks ofc), but this is the most annoying thing that ever happened, and yes I think it's unplayable. Also I don't understand why you are trying to defend those kind of bugs in development snapshots. I understand that new things could break features and create bugs that have to get found throughout playing. But this kind of thing (along with the arrows stuck in mid-air for example) clearly show how the development of MC is done in a very uneffective way when it comes to bugtesting before releases. You would find this bug with only five minutes of gameplay.

The problem with this bug is that if you are anywhere in some hill-country you basically can't do normal gameplay anymore. This is a snapshot, specific to let us test stuff. Well, this makes it really, really hard to test stuff. Same with the lag-problem. If you can hardly play, then there is no use for a snapshot. Breaking the world? No problem! Just start a new one and go play. But not being able to play in a bit normal way is very anoying.
Most bugs you can play around or just don't use it. But this is basic gameplay that is very broken, so yeah, it is a big deal...

also happens with horses.

If the player walks against a block then deletes the block under them (or walks against a floating wall), they will float against the block and be able to move along a wall (if there is a wall) at walking speed. It's as if the player's hitbox is inside of the block, but if the player ever presses the jump key, they will fall.

Bunnies seem to be struggling to jump up blocks, too. Or have they always been that lame? They seem to be getting stuck running against a block.

Editing to add: I can go up blocks OK now. Just need to start my jump early, at the point you use when sprinting.

Sure it's just a snapshot, but I think it as a little recklessness to not test it before launching. Like someone else said above, with five minutes of gameplay it's possible to observe those bugs and fix it and avoiding headaches. Maybe they're lacking of people and time, but it's getting annoying to see avoidable bug in every new snapshot. Only if those bugs were minor ones, but they are not.

Well, but the new features are really nice though. Keep on the excellent work, Mojang, but, please, try to be more prudent.

I also encountered this situation, which made our operation inconvenient, and when we are running, jumping over the block would cause us to revert back to "moving".

Even on auto-jump, two slopes in a row will result in your character moving into the block. You can't autojump unless you are relatively far from the block.

I think this is a consequence of the changed collision mechanics as mentioned in the update.

And adding to the variety of machines experiencing this: Debian Testing on OpenJDK 11.0.2+7deb1 64-bit.

I am also having this issue. If I am holding the key to walk forward but am stopped by being up against a block, and I then hit jump, I cannot jump. Not until I either move away from the block, or stop walking forward. I agree with Third Eye, Igor, and others' comments above; this is an example of a very, very basic and vital gameplay mechanic that is unusable, which seems to be a repeated issue.

I understand that the whole purpose of the snapshots is to basically outsource bug-finding and general playtesting to the community, but I agree in feeling that the frequency of such basic issues like this is most likely a huge headache for everyone involved that could be solved in other ways; it seems to me that it would be more productive to have the snapshots playtested just slightly more thoroughly for the most basic usability, before releasing them to the public for more detailed and extensive playtesting. I feel like it's going to keep a lot of people from being able to play normally and thus find rarer but still important bugs, if they can barely use the basic gameplay functions, which just slows everyone's ability to help and sort of shoots the best utilization of the community in the foot. If we're all impaired in something as simple as moving around within five minutes, we stop being as effective at finding the things it actually takes time and involved gameplay to come across, which is where the community manpower seems like it would be best used. Not, dozens of people saying "hard to move" as soon as the snapshot is released. 

As far as actually solving this, I'm sure there are LOADS of people available worldwide who would be happy to be employed for a reasonable wage simply playing Minecraft to find these most basic bugs as fast as possible before every other snapshot user has to also deal with them. And for every bug a public release doesn't have, that's like, a minimum of half a dozen duplicate bug reports that no longer clog up the system for the people who have to handle and respond to them! 

@Remy Z That's why it's called "snapshot". It's "for those who are curious and can't wait, that's how far we are right now" and not "this is what you should play". If you expect basic QA to be done before you play, just wait for the (pre-)releases and play 1.13 until then. Mojang are just giving you the choice not to wait for their QA, what you are demanding would mean everyone would have to wait for the prereleases. It's not like Microsoft/windows forcing you to try their betas.

@_xlf Yikes. I'm not "demanding" anything, I'm echoing several other people's comments that this isn't the best way to utilize us as snapshot players for our ability to help. Our free help, even, which I'm pointing out is being somewhat wasted in situations like this. I'm trying to emphasize what would make us more useful to the devs, I'm not just sitting here complaining with no purpose. I'm identifying and elaborating upon a specific problem other people have also noted, pointing out why it's a problem, why it would be worth it to solve, and possibly how. 

hello , after the patch today is realy nice all jump work , its a plaisure to play again , thanks