Item models break when tools with durability use the Unbreakable tag.

When I give myself any tool, such as a sword or a shovel with a damage value greater than 0 and the Unbreakable tag, the item model breaks.

For example.
When I do "/give @p golden_sword 1 0" I get a golden_sword
When I do "/give @p golden_sword 1 0

{Unbreakable:1}

" I get an unbreakable golden sword
When I do "/give @p golden_sword 1 20" I get a slightly damaged golden sword.
but when I do "/give @p golden_sword 1 20

{Unbreakable:1}

" I get a broken model (See picture for reference)