Custom-made diamond weapons still show the same Attack Damage attribute when upgrading to netherite.

Steps to reproduce:

1.  

/give @p diamond_sword{AttributeModifiers:[{AttributeName:"generic.attack_damage",Amount:7,Operation:0,UUID:[I;-12108,30219,133832,-60438],Slot:mainhand,Name:"generic.attack_damage"},{AttributeName:"generic.attack_speed",Amount:1024,Operation:0,UUID:[I;-12108,30219,133832,-60438],Slot:mainhand,Name:"generic.attack_speed"}]} 1

2. Upgrade the weapon to netherite

 It still shows Attack Damage: 7

3. Summon a spider

4. Kill it with the sword that you upgraded

 The spider gets killed in 2 hits as expected, so it is just a visual UI issue.

Possible fix:

Make diamond tools and weapons always receive +1 Attack Damage point if they get upgraded to netherite.