The fix didn't fix it (because the date is not NULL but POSIX or something similar).

CRAN maintainers have been really helpful in trying to sort this out:

There are really two issues here.

One, the current CITATION code is very complicated and uses non-exported
functions from utils, which should be avoided. Afaict, the intention is
to use the auto-generated citation with the zenodo DOI added. In this
case, one could simply do

bibentry("Manual",
doi = "10.5281/zenodo.3957489",
other = unlist(citation(auto = meta), recursive = FALSE))

However,

(a) CRAN will eventually also get DOIs for the packages

(b) Afaict, the given DOI pertains to a specific version of the package,
which is not the current CRAN version. So I think it would be better
to use

citation(auto = meta)

and provide a bibentry with the static bib info corresponding to the
particular doi given. Which is version 1.4.0 and has Published
September 26, 2023, hence year should be 2023 and there is no need to
dynamically compute it in the CITATION file.

We could

stop doing Zenodo releases, or
continue to do them and then make sure to update before every release

(1) might be a good option in the light of (a) above?

CITATION file uses unset meta$Date #668

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CITATION file uses unset `meta$Date` #668