When you hit the enderdragon near the legs with a diamond sword, it displays the particles for when a mob is hit, but it does not flash red and its health does not decrease. I checked with F3+B and I was hitting within its hit box. When you hit the side of the body, it can take damage, but not from the back.
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Still in 1.14.4

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We're tracking this issue in MC-158205, so this ticket is being resolved and linked as a duplicate.
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Related or duplicated of MC-156522