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This is the crosshair when you are looking at an entity when holding a tool. When you aren't holding a tool, the blade/indicator under the crosshair is absent. However, with mining fatigue, the indicator is always there when looking at an entity even though you aren't holding a tool.
Steps to Reproduce:
1) Look at an armour stand holding nothing
2) Run
/effect give @s mining_fatigue
3) Notice that the attack indicator appears
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Can confirm
Can confirm in 1.20.2 & 23w42a