The bug
When viewed from inside on an armor stand, some parts of the dragon head block have visible z-fighting.
Related issues
discovered while testing
is duplicated by
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You don't need to add this to every ticket you create.

More or less fixed in 19w41a since entity insides are no longer rendered. Keep an eye out for regressions, though.

Please mark as Fixed.

Regression in pre4, please reopen

Another bug which is MC-190127 describes that it also happens when placing a Dragon Head and then viewing it from the inside in Spectator mode.
Hi there!
Confirmed for snapshot 20w27a.

I cannot reproduce in 20w46a. Edit: nvm The z-fighting are on the ears
Can confirm in 20w51a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 21w08b.
Can confirm in 1.16.5.
Can confirm in 21w10a. Video attached.