[NeoForge 1.21.1] Incompatibility with Caverns & Chasms - items sometimes do not stack? #8

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opened 2026-07-04 06:26:42 -04:00 by unilock · 1 comment

I noticed in my very large modpack that items of the same type would sometimes refuse to stack in the inventory. I narrowed it down to two mods - Caverns & Chasms and Menderman.

By creating a NeoForge 1.21.1 instance and installing Blueprint, Caverns & Chasms, and Menderman, the issue can be easily reproduced by /give-ing yourself sticks and then attempting to craft sticks from planks. The given sticks and the crafted sticks will not stack. Note that this occurs with all items, not just sticks.

I noticed in my very large modpack that items of the same type would sometimes refuse to stack in the inventory. I narrowed it down to two mods - [Caverns & Chasms](https://modrinth.com/mod/caverns-and-chasms) and Menderman. By creating a NeoForge 1.21.1 instance and installing Blueprint, Caverns & Chasms, and Menderman, the issue can be easily reproduced by `/give`-ing yourself sticks and then attempting to craft sticks from planks. The given sticks and the crafted sticks will not stack. Note that this occurs with *all* items, not just sticks.
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I'm going to guess on a whim that this is an issue with Menderman not syncing its fallback data components to the client.

I might take a proper look into this when I'm more well rested and able to tackle 1.21.1 again, but I'll take a look at what Blueprint/Caverns and Chasms is doing and investigate later.

I'm going to guess on a whim that this is an issue with Menderman not syncing its fallback data components to the client. I might take a proper look into this when I'm more well rested and able to tackle 1.21.1 again, but I'll take a look at what Blueprint/Caverns and Chasms is doing and investigate later.
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Modding/menderman#8
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