If you put fire coral fans in a 2x2 manner, you get a symbol in the middle that resembles a swastika. Also applies to dead fire coral fans.
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Can confirm in 21w08b.
Can confirm in 21w11a.
Can confirm in 21w13a.

Attached a resource pack with the fix:
[media]And also attached a comparison:
[media]
Can confirm in 1.17.

Can confirm in 1.17.1 Pre-release 2.

Can confirm in 1.17.1 Release Candidate 1.

We will not fix this, as it is difficult to see unless at the right angle, with the right set of block combinations. See new images.
U don't even need a 2x2. It's enough to look at one from above.
Can confirm in 21w08a.