The bug

Some block and entity inventory slots contain item outline textures overlaid on top of the slot to indicate what they accept. When an item is placed into these slots, the game does not behave consistently with respect to if the outline disappears or not.

Prior to 23w31a, these cases were covered in MC-74408. However, that ticket now only covers brewing stands, even though the issue persists for other slot types.

How to reproduce

A resource pack is attached to this ticket which replaces several item textures and models with small squares, allowing the outline to still be seen if it is not hidden if an item is added to a slot.

Table of slots

The following are all of these outline-using slots as well as how they behave when an item is added. The expected behaviour is that the outline would disappear when an item is placed within, which does not always happen.

Slot	Result	Notes
Player armor slots	Outline hidden	Original behaviour
Player offhand slot	Outline hidden
Enchanting table lapis lazuli slot	Outline hidden	Fixed in 23w31a by MC-259401
Smithing table template slot	Outline hidden
Smithing table material slot	Outline hidden
Smithing table input item slot	Outline hidden
Loom banner slot	Outline hidden	see also MC-264592
Loom banner pattern slot	Outline hidden	see also MC-264592
Loom dye slot	Outline hidden	see also MC-264592
Brewing stand fuel slot	Outline still present	Likely caused by MC-74408
Brewing stand bottle slot	Outline still present	Likely caused by MC-74408
Horse/donkey/mule saddle slot	Outline still present	see also MC-264592
Horse armor slot	Outline still present	see also MC-264592
Llama carpet slot	Outline still present	see also MC-264592

How to fix

Fixing MC-74408 would likely fix the brewing stand case. For the horse and llama cases, the normal "slot" texture would need to be used, with the "armor slot"/"saddle slot" texture overlaid on top, like is the case with most other slots.

Further notes

On a tangientally related note, it may also be worth moving all of the slot outline textures from the "items" directory to the "gui" directory since they're GUI related. Loom, horse and llama slot textures are already under "gui", so no change is needed here. The following textures would be moved and possibly renamed:

• item/empty_armor_slot_boots.png
• item/empty_armor_slot_chestplate.png
• item/empty_armor_slot_helmet.png
• item/empty_armor_slot_leggings.png
• item/empty_armor_slot_shield.png
• item/empty_slot_amethyst_shard.png
• item/empty_slot_axe.png
• item/empty_slot_diamond.png
• item/empty_slot_emerald.png
• item/empty_slot_hoe.png
• item/empty_slot_ingot.png
• item/empty_slot_lapis_lazuli.png
• item/empty_slot_pickaxe.png
• item/empty_slot_quartz.png
• item/empty_slot_redstone_dust.png
• item/empty_slot_shovel.png
• item/empty_slot_smithing_template_armor_trim.png
• item/empty_slot_smithing_template_netherite_upgrade.png
• item/empty_slot_sword.png