In src/usethis/_file/toml/io_.py and src/usethis/_file/yaml/io_.py, the remove_from_list method silently returns when it encounters invalid config (e.g., a non-dict parent or non-list value at the target key). The user receives no feedback that their configuration was ignored.

We should call warn_print to inform the user that invalid config was detected and skipped, using the error messages already provided via the err= arguments to validate_or_raise.

Affected files:

• src/usethis/_file/toml/io_.py (lines ~429-440)
• src/usethis/_file/yaml/io_.py (lines ~457-468)

This is a pre-existing issue that predates the validate_or_raise refactoring — the original code also silently returned on invalid config.