To recreate issue:
In any gamemode (other than spectator) hold a block in your hand. The cursor changes from the normal + to a square.
I expected the normal + shape to be the cursor.
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[media]
Broken resource pack.
@Blah nope, this happenes in 90% of my resource packs. The crosshair is fine after death but as soon as you pickup or hold an item in your hand it becomes a square.