This issue:
affects block and item models the same way.
is still present when enabling the “Improved Transparency” options.
does not seem related to cullfaces.
Without a texture pack, the only case where this applies seems to be slime blocks and honey blocks (MC-163098), as shown here:
Improved Transparency does not fix the issue as seen here:
However, it also affects items, as shown in this image, where I replaced the iron sword model with a custom model:
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Thank you for your report!
After consideration, the issue is being closed as Won't Fix.
Please note that this is not the same as Working as Intended, as this bug report correctly describes behavior in the game that might not be the intended or desirable behavior, but it will not be fixed right now. Sometimes, this is because the issue reported is minor and/or impossible to change without large architectural changes to the code base.
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Can confirm