When repairing an item with components, almost all components are removed, with the exception of “max_damage”, which seems to skip the operation.

How to reproduce :

• Give yourself a custom tool 2 times: 

  /give @s minecraft:iron_sword[minecraft:custom_model_data=2561001,minecraft:custom_data=\{customdata:1b},minecraft:item_name='\{"text":"custom"}',minecraft:max_damage=50]
  

• Put these 2 tools in a craft table to perform the tool repair manipulation.
• Taking an original item (in this case, an iron_sword) and looking at its components with the command:

  /data get entity @s SelectedItem

We see that the only remaining component is “max_damage”...

Expected behavior :

• It would be nice if all components were transferred when repairing a custom tool via the craft table.
• Or give players the opportunity to detect items with custom components in the crafting table input.

Demonstration images:

Craft demonstration

Original item components

Repaired custom item components

Original custom item components