Try doing the same thing with fruit. This mod is a JSON only mod and does not introduce any code that could cause this, so this is a base-game bug.

From what I understand, you tried to put 2 unpressed mash into the block. Understand that behind the scenes you are swapping item codes and values and no amount of code can accommodate every edge-case someone might try. 

Buggi encountered a hard crash, put honeycomb into press, removed the unpressed mash, put another amount of honeycomb in, took unpressed mash out, put mash 1 in, tried to put mash 2 in as well, instant crash, no lock up. Here's the crash log; https://pastebin.com/fibN6njk

Obviously, there's no guarantee that this mod is the cause, but it might be worth checking.

So I'm seeing people using it in 1.20 just fine and reporting it's working, then I see people ask for an update. Which is it?
This is a dead simple mod that shouldn't break between versions.
If it did break, can I get details on how? Even going so far as to check log files for errors.

Please update this mod

What other mods do you have installed?

I seem to be running into a problem with this one in local hosted multiplayer for 1.20.1. It works like a charm if I load the same world with all the same mods in singleplayer, but the moment I host it as multiplayer it acts as though it's not installed, including turning any existing pressed wax into a black square and causing me to eat honeycomb instead of putting it in the press. Not sure why this is happening, I could've swore it worked fine before but I don't actually remember if I had this mod specifically in my multiplayer before now 😔

I'm using this in 1.20.1 and it works well.

I customised it so that each honeycomb gives 0.5 litres (so the sat gotten from one honeycomb is equal to if you ate the honeycomb raw) and changed the grid recipe to give 2 beeswax for each pressed. I love this. I've always thought it so weird that squeezing one honeycomb gives 60 sat where as eating the wax from the honeycomb gives 300 (despite the body's inability to digest wax). Now I can reason that squeezing by hand only gives 0.2 litres because you're ineffcient and messy, but doing it by press means you get all that lovely sat and the wax!

Big thumbs up for the mod and thanks for explaining how to customise it ourselves.

Let me know if 1.20 breaks this.
It's a fairly simple mod, and it shouldn't break, but if it does, let me know!

Not surprising, JSON only mods tend to work across many versions. The simplier the mod the better. My Rock blocks and Quartz Blocks mods haven't needed an updated in 3 years!

This works in 1.20 for me.

It should, it's purely a JSON mod, which are very robust and don't break between versions. My Rock Blocks mod hasn't changed since I made it.

Can anyone confirm if this works using v.1.19pre?

You can press less. Press 5 at a time and you will get nice even returns.

The 9.89L error is caused by the press code rather than you. As others have said, making it so you can press less than 10L at a time is one possible solution.

Also, Expanded Foods also adds honey pressing, so if you have that, you don't need this mod.

IDK about the honey, but a workaround for fruit is to only press 16 at a time. You will press out exactly 5L of juice. Makes it more time consuming, but no loss of juice.

Thanks @Janub I did just that. The mod still has ample benefit (10/10 ratio) than doing it by hand. As I use honey for a LOT of recipes I wanted a real benefit to using the press. Read the description above for help on changing that ratio fairly simply for your game to whatever ratio you want.

I still haven't found a way to force the litres per item, the press always gives less than the total amount it should.

I really like the concept of this mod and might have an idea to solve both problems outlined in the description: Instead of returning wax directly from the press, you could instead output some sort of "pressed wax block" item, which can be crafted into some number of wax items. This way you can balance both wax and honey output to be more in line with the vanilla yield, and at the same time clear the attributes (I think). The only disadvantage would be the addition of a new item, which would also need new textures, but you might be able to reuse the model of the vanilla pressed mash item and just change the texture to something more wax-like.

Really love this mod, however as of 1.16.3 it doesn't seem to be working.

Pressed honey is a thing. Some beekeepers say it makes the honey even better and healthier than when centrifuged. Good QoL mod for those who like keeping a lot of bees

to press honey, this is something new 🤔