As solid blocks completely occlude this face, a cullface argument here would be logical.
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Can confirm.
Can confirm in 21w06a.
The face is actually not at the top just very close to. We'd have to figure out why.
Can confirm in 21w11a. Video attached.

Can confirm in 21w13a.
Can confirm in 21w14a.
Can confirm in 21w16a.
Can confirm in 21w17a.