remote store build (--store) causes benign "don't know how to build these paths" log

[rickynils]

When running a remote store build (using nix build --eval-store --auto --store ssh-ng://...), Nix can output don't know how to build these paths before proceeding and building the derivation:

don't know how to build these paths:
  /nix/store/i22fvb148z1z4kp421lslna1nsaxb36h-plutus-core-1.1.1.0.drv
copying 0 paths...
copying 0 paths...
building '/nix/store/62yv7ln16y8z7aslfmmv28iv79m7639x-cardano-crypto-class-lib-cardano-crypto-class-2.0.0.1.drv'...
building '/nix/store/clvhbygc0bnl1phlf7b7yx770n1v0n7g-multiset-lib-multiset-0.3.4.3.drv'...
building '/nix/store/3y5a2c6qab2ji8328f93z4i3hs1vyg24-quickcheck-transformer-lib-quickcheck-transformer-0.3.1.2.drv'...
building '/nix/store/6knjyvlqg8w3hg4ib1xrx2248gamkibn-prettyprinter-configurable-1.1.0.0-setup.drv'...
...

This doesn't seem to hurt anything, but is a bit confusing.