snapshot kind find source from LOCAL pkgs when that has CRAN

I'm relying on a local, newer version of a package that is also on CRAN.

That means, of course, that that package has in the DESCRIPTION

Repository: CRAN

When I now do some dev on this package locally, install it via packrat::install_local(pkgs = pkgs) and then run packrat::snapshot() I get:

> packrat::snapshot(prompt = FALSE)

Upgrading these packages already present in packrat:
               from      to
    qmethod   1.5.0   1.6.0

Fetching sources for qmethod (1.6.0) ... FAILED
Error in snapshotSources(project, activeRepos(project), allRecordsFlat) : 
  Errors occurred when fetching source files:
Error in getSourceForPkgRecord(pkgRecord, sourceDir, availablePkgs, repos) : 
  Couldn't find source for version 1.6.0 of qmethod (1.4.2 is current)

The problem disappears when I delete Repository: CRAN from the DESCRIPTION.

Intended Behavior? Odd? Bug?

I would think that this happens a lot when people use "fresher" versions than on CRAN ...

Reproduce the issue with packrat::install_local(pkgs = pkgs) followed by packrat::snapshot(prompt = FALSE), using a local package newer than its CRAN version. Start at snapshotSources and getSourceForPkgRecord, then verify that snapshot can identify the local source for the newer package despite Repository: CRAN in DESCRIPTION.