The bug
The texture for the cake block model does not support transparency in the 1.13 snapshots, the cake item model texture is unchanged. I was expecting the texture to render like it does in current release 1.12.2.
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Can you please upload a example resource pack.
May I inquire about any difference between "Community Consensus" and "Confirmed"?
*EDIT added pic link
Here is a sample pack containing only the cake in question, hosted via Minepack. https://download.nodecdn.net/containers/nodecraft/minepack/0579bfe3d294af1015c94eb9bb61c520.zip
Here are some additional images.

The link in question no longer works. Can you upload the resource pack here?

I believe I can reproduce what this issue describes in 21w44a with a custom-made resource pack:
[media][media]

In 22w03a.
Confirmed.