If you see warnings/errors on GitHub Actions related to Matrix incompatibilities for your R package, see this issue for possible workarounds: https://github.com/r-lib/actions/issues/832
@_TimTaylor It does. The root of the problem is that CRAN currently has
Package: Matrix
Version: 1.6-5
but R 4.4.0 actually ships Matrix 1.7-0 which has breaking changes. PPM currently builds 1.6-5, because that's what's on CRAN, and builds all dependencies based on 1.6-5. But then these do not work with the pre-installed 1.7-0.
I would think that the shipped version of Matrix should be available on CRAN, e.g. for installations that do not have recommended packages. But that's not the case.
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