Items with "damage_per_block" and "max_damage" that aren't originally tools or have durability settings, don't seem to get damaged at all.

Examples:

Expected: item breaks after 6 uses
Result: item doesn't take durability

/give ChimeraDev stick[minecraft:max_damage=12,minecraft:tool={damage_per_block:2,rules:[

{blocks:"minecraft:stone",speed:5,correct_for_drops:true}

]}]

Expected: item breaks after one use
Result: item doesn't take durability

/give ChimeraDev stick[minecraft:max_damage=6,minecraft:tool={damage_per_block:6,rules:[

{blocks:"minecraft:stone",speed:5,correct_for_drops:true}

]}]

These examples do work if you use an item that originally has damage values.