Duplicate --config=foo produces a seemingly pointless warning

As of Bazel 3.2.0, if you have build --config=foo in multiple places (like .bazelrc and ~/.bazelrc), bazel build produces the following warning:

WARNING: The following configs were expanded more than once: [foo]. For repeatable flags, repeats are counted twice and may lead to unexpected behavior.

It's not clear under which scenario --config=foo may be "repeatable" or produce "unexpected behavior". To my understanding, such a thing cannot happen, and hence the warning seems like a bug. There does not appear to be any conflict in the requested flags. Could the warning be removed?