A simple mod to fix the tooltip rendering, when the attribute modifiers from an item are loaded through NBT. To achieve the correct tooltip you have to use the correct UUID's for the attributes.

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If you are using commands or something else where you need to add the UUID as NBT to add attributes, use these:

Attack Damage: [I;-885041709,1683771192,-1533567981,-1556236849]
Attack Speed: [I;-98353636,1098926181,-1340359474,-1752847197]
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Here is an example for a diamond sword:
/give @p diamond_sword{AttributeModifiers:[{AttributeName:"generic.attack_damage",Amount:6,Slot:mainhand,Name:"generic.attack_damage",UUID:[I;-885041709,1683771192,-1533567981,-1556236849]},{AttributeName:"generic.attack_speed",Amount:-2.4,Slot:mainhand,Name:"generic.attack_speed",UUID:[I;-98353636,1098926181,-1340359474,-1752847197]}]} 1

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If you are using KubeJS or another mod which let's you define attributes directly through the UUID string, use these: