# Stackable shulkers fix
\nA simple addon to the Carpet mod that fixes the 1.20.5+ behaviour of stacked shulker boxes to be the same as in older versions, as well as some optional features.<\/p>\n
## Features
\n> **NOTE**
\nFeatures marked as `intrusive` are modifying the standard behaviour in their default state. This is done to maintain compatibility with older versions of the mod.<\/p>\n
### Fixed hopper transfers
\nPrevents hoppers from stacking shulker boxes, even if the max count is >1.
\n*Setting this rule to `false` enables the functionality of this mod by preventing shulkers from being stacked by hoppers.*<\/p>\n
– Name: `hopperShulkerStacking`
\n– Type: `boolean`
\n– Default: `false`
\n– Categories: `shulkerfix`, `bugfix`, `intrusive`
\n– Since: `1.5`<\/p>\n
### Fixed comparator output
\nChanges how stacked shulker boxes affect comparator output:
\n1. `true`: Shulkers have signal strength of unstackable items, allowing output up to 897 (AKA OSS\/HSS);
\n2. `false`: Shulkers have signal strength of stackable items, reaching 15 when all slots are full (hoppers won’t be able to fill over SS1);
\n3. `capped`: Shulkers have signal strength of unstackable items, but the resulting output is capped at 15. This implementation preserves overstacked item filters.
\n4. `normalized`: Any amount of shulkers in a slot is counted as a single unstackable item. This limits the output to signal strength 15 and patches overstacked item filters.<\/p>\n
– Name: `overstackedShulkerSignalStrength`
\n– Type: `string`
\n– Default: `true`
\n– Options: `true`, `false`, `capped`, `normalized`
\n– Categories: `shulkerfix`, `bugfix`, `intrusive`
\n– Since: `1.7.1`<\/p>\n
### Legacy shulker item merging
\nReintroduces the logic for merging shulker box items before 1.20.5.
\nThe implementation allows partial item merging
\n*(normally the game doesn’t merge item stacks if the total amount is more than the max size)*
\nand resets the entity age, allowing faster merging.
\n*(Both were bugs in Carpet, but no one complained, so now we’re reintroducing the bugs huh)*<\/p>\n
– Name: `legacyShulkerItemMerging`
\n– Type: `boolean`
\n– Default: `false`
\n– Categories: `shulkerfix`, `experimental`
\n– Since: `1.6`<\/p>\n
### Hopper collection
\nMakes hoppers pick up one shulker at a time from an entity stack.
\nNote that this has a risk of breaking contraptions.<\/p>\n
– Name: `hopperCollectSingleShulkers`
\n– Type: `boolean`
\n– Default: `false`
\n– Categories: `shulkerfix`, `feature`, `experimental`
\n– Since: `1.5`<\/p>\n
### Hopper minecart collection
\nMakes minecarts pick up one shulker at a time from an entity stack.
\nNote that this has a risk of breaking contraptions.<\/p>\n
– Name: `minecartCollectSingleShulkers`
\n– Type: `boolean`
\n– Default: `false`
\n– Categories: `shulkerfix`, `feature`, `experimental`
\n– Since: `1.5`<\/p>\n
### Minecart slowdown
\nDisables the additional slowdown caused by overstacked minecarts.
\nThe implementation makes shulker boxes count as 64-stackable when calculating the minecart slowdown. However if `overstackedShulkerSignalStrength` is enabled, reading the fill level will still output the overstacked value.
\n*Setting this rule to `false` enables the functionality of this mod by removing the additional slowdown.*<\/p>\n
– Name: `overstackedMinecartSlowdown`
\n– Type: `boolean`
\n– Default: `true`
\n– Categories: `shulkerfix`, `feature`, `experimental`
\n– Since: `1.5`<\/p>\n
### Client count fix
\nFixes Carpet issue #1899,
\nwhere vanilla clients see stacked shulker boxes as single items inside containers.
\n– Name: `clientShulkerSync`
\n– Type: `boolean`
\n– Default: `false`
\n– Categories: `shulkerfix`, `bugfix`, `experimental`
\n– Since: `1.4`<\/p>\n","protected":false},"excerpt":{"rendered":"
Fixes issues with stackable shulker boxes in Carpet on 1.20.5+<\/p>\n","protected":false},"featured_media":147770,"template":"","meta":{"_minecraft_slug":"stackable-shulkers-fix","_minecraft_project_id":"qr7VQIiR","_minecraft_author":"KikuGie","_minecraft_license":"MIT","_minecraft_downloads":17683,"_minecraft_follows":41,"_minecraft_client_side":"unsupported","_minecraft_server_side":"required","_minecraft_storage_type":"zip","_minecraft_archive_name":"stackable-shulkers-fix.zip","_minecraft_size_bytes":799809,"_minecraft_version_count":38,"_minecraft_updated_at":"2026-05-17T01:05:38.676995Z","_minecraft_date_created":"2024-06-23T04:50:04.202480Z","_minecraft_date_modified":"2026-04-02T09:24:44.546863Z","_minecraft_project_url":"https:\/\/modrinth.com\/mod\/stackable-shulkers-fix","_minecraft_icon_attachment_id":147770,"_minecraft_imported_at":"2026-06-08T20:52:32+00:00","_minecraft_import_hash":"f7e9760e76d36a16c66c79a182f39e43","_minecraft_versions":"","_minecraft_links":"","_minecraft_gallery":"","_minecraft_api_metadata":""},"mod_category":[97,89,91,92],"mod_loader":[99],"minecraft_version":[101,102,62,37,40,41,73,74,38,78,79,80,81,82,83,167,163],"class_list":["post-147769","mod","type-mod","status-publish","has-post-thumbnail","hentry","mod_category-fabric","mod_category-game-mechanics","mod_category-storage","mod_category-utility","mod_loader-fabric","minecraft_version-1-20-5","minecraft_version-1-20-6","minecraft_version-1-21","minecraft_version-1-21-1","minecraft_version-1-21-10","minecraft_version-1-21-11","minecraft_version-1-21-2","minecraft_version-1-21-3","minecraft_version-1-21-4","minecraft_version-1-21-5","minecraft_version-1-21-6","minecraft_version-1-21-7","minecraft_version-1-21-8","minecraft_version-1-21-9","minecraft_version-26-1","minecraft_version-26-1-1","minecraft_version-26-1-2"],"yoast_head":"\n