If trying to combine two identical piece of undamaged armour with a maximum durability of 2147483647 in a grindstone, the result will not appear to be a single piece of armour with a full durability. Instead, the durability of the resultant armour will be 21474834, which also means that the grindstone fails to add extra 5% durability to the repaired armour.
HOW TO REPRODUCE
Use the command "/give @s netherite_boots[max_damage=2147483647] 2" to gain 2 same boots;
Press down F3 + H and then get a grindstone;
Put the two boots into the GUI of the grindstone, then ensure that your cursor is on the top of the resultant item.
Attachments
Comments 4
After some experimentation, I have found that 2,127,031,424 is the lowest value of max_damage this bug can be reproduced with.
Thank you for your report!
After consideration, the issue is being closed as Won't Fix.
Please note that this is not the same as Working as Intended, as this bug report correctly describes behavior in the game that might not be the intended or desirable behavior, but it will not be fixed right now. Sometimes, this is because the issue reported is minor and/or impossible to change without large architectural changes to the code base.
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Can confirm