Crafting Grid disappears when picking your backpack up after putting it down.
After applying the crafting grid upgrade, if you put down the backpack and then either use Shift+Click to put the backpack back on again or if you destroy the backpack to pick it up again, the Crafting Grid is completely gone. You have to apply a new upgrade to the backpack.
After applying the crafting grid upgrade it should remain unless you purposely remove it by resetting the backpack.
Minecraft 1.21 Fabric 0.15.11 Mod 10.0.0
Crafting Grid disappears when picking your backpack up after putting it down.
After applying the crafting grid upgrade, if you put down the backpack and then either use Shift+Click to put the backpack back on again or if you destroy the backpack to pick it up again, the Crafting Grid is completely gone. You have to apply a new upgrade to the backpack.
After applying the crafting grid upgrade it should remain unless you purposely remove it by resetting the backpack.