Version Information

lithium-fabric-mc1.21-0.12.5

Expected Behavior

The comparator reading the shulker box should not output a signal if the shulker box is empty

Actual Behavior

Sometimes when using a box unloader once the shulker box has been drained of all it's items, the comparator reading the box retains powered with a signal strength of 1. This does not occur without the mod, granted this has not been extensively tested but it usually breaks after 2 or 3 shulkers through the unloader and has not happened yet in Vanilla.

Reproduction Steps

Not exactly 100% sure as I have only tested using a particular box unloader but other than that place a comparator facing away from a shulker box and then empty it, sometimes the empty shulker box will still have a signal strength of 1 read from it.

Other Information

Tested on a private fabric server running Lithium, FerriteCore, C2ME, Bluemap, Jade, No-enderman-grief, and Spark

@Shoftie03 is your video recorded in singleplayer with only lithium installed, or is it on a server? If it is on a server, which mods are installed on the server?

It is in a singleplayer save of the exact world download in rapscallion's video. I deleted the previous save which I had accessed previously with tweakeroo to unzip a new one, and could still reproduce the issue.

What are you putting into the shulker boxes, are you putting them into the storage hall's input chest?

Confirmed by using the Rapscalliion world download at the location with 10+ fully filled boxes in the nearby chest

That's interesting as the unloader I was facing the issue on was for the CartMIS V2 (https://www.youtube.com/watch?v=LPshwkDboXk). Which the unloader for the CartMIS V3 (the video linked above) uses a very similar or the same unloader for the input. I have just tested on a fresh download of CartMIS V2 and can reproduce again (with only Lithium on my client).

I also had a look at the Storage Tech discord earlier and someone is also facing this issue with the CartMIS V3.

Additionally, I went back onto the server with Lithium installed with the unloader in a state with a powered comparator from an empty shulker box and no matter how many times I removed and replaced the comparator it would be powered, this was even retained on a server restart. But after removing Lithium and restarting replacing the comparator is de-powered and was fixed.

After some more testing I think my attempt to reproduce the issue was broken, because I assumed the empty box shouldn't stay there no matter the comparator state. Can't reproduce in further testing

Workaround: Add line to config/lithium.properties file:
mixin.block.hopper=false

I used the sample hermitcraft boxes provided in the outskirts of the wdl (I think I used Grian's set). I nbt copied the barrels, placed them down and put them manually into the input chest inside the hall. Initially I observed the issue with carpet creativeNoClip and thought it was something to do with collision but that's probably irrelevant.

Thank you very much, reproduced for sure now

Are you two only unloading fully-filled shulkers? As I'm attempting to re-produce using half-filled shulkers and I am not getting the issue. So possibly this only occurs when draining full shulkers to empty?

This probably requires different item types, with some hopper minecarts not being able to pull items due to the different item type

1f97499

I am consistently able to reproduce this issue with a full shulkers of non-stackable, not with 16 or 64 stackables

edit: but seems like 2no2name has already resolved this issue; thank you very much!!

Nice! Thanks for your work in fixing it.

Cannot reproduce. Tested with only lithium installed, placing a bunch of hoppers, comparators reading the block above the hopper, then placing a shulker box with a few items inside already on top of the hopper, allowing the comparator to read it. After a while all comparators turn off.

Maybe test this with and without the other mods to rule out any mod incompatibilities. Otherwise please provide the exact setup (e.g. world download) where the issue shows up

I have tested this on both Lithium 1.20.6-0.12.4 and 1.21-0.12.5, running on Prism Launcher Java 21 and can reproduce this issue. The comparator will not update even if the shulker box is empty until a block update is given to it.
https://youtu.be/CQjt4UU92U8 -> where I was able to reproduce this issue
https://youtu.be/9eHcvMi7HUw?si=_d4eJpfItmNGNqeA -> Rapscallion's latest CartMIS sorter, I was able to reproduce this issue in the wdl given: the comparator for the shulker unloader at -2 -46 22 won't update

edit: no other mods aside from lithium present, and issue can be reproduced even without tick sprinting