Unexpected message regarding a canonical reproducible form

I'm observing an unexpected message from Bazel regarding something to do with a canonical reproducible form:
```
DEBUG: Rule 'rules_jvm_external' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "c44568854d8bb92fe0f7dd6b1e8957ae65e45e32a058727fcf62aaafbd36f17b"
DEBUG: Repository rules_jvm_external instantiated at:
/home/jtilahun/devel/monorepo/WORKSPACE:394:22: in
/home/jtilahun/.cache/bazel/_bazel_jtilahun/631401b279131cec2af38b618ccb198e/external/com_github_google_copybara/repositories.bzl:36:10: in copybara_repositories
/home/jtilahun/.cache/bazel/_bazel_jtilahun/631401b279131cec2af38b618ccb198e/external/bazel_tools/tools/build_defs/repo/utils.bzl:233:18: in maybe
Repository rule http_archive defined at:
/home/jtilahun/.cache/bazel/_bazel_jtilahun/631401b279131cec2af38b618ccb198e/external/bazel_tools/tools/build_defs/repo/http.bzl:372:31: in
```

I don't believe this message is expected because I didn't modify any arguments in anything internal to Copybara.

I'm on Copybara commit 19ed6478.