The /scoreboard command has some weird stuff.
If you type /scoreboard objectives add [whatever] minecraft.broken:
you can see a list of things, including things that technically cannot be broken, like non-placeable items (armadillo scute, armor trims, etc.)
This either points to a future addition (placeable items, but I doubt it because it has been this way for a very long time) or is just a logical oversight.
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