The rules in protobuf and built-in Bazel don't mix well. Different aspects may cause actions conflicts. The safest way is to use built-in rules whenever they are still present.
proto_library should be safe, because it's not using an aspect. py_proto_library never had a built-in implementation, so it's also safe.
This still makes it possible to use the rules on Bazel 7, but only with --incompatible_autoload_externally enabled.
PiperOrigin-RevId: 678446311
Bazel 6 falls back to native rules, because of ProtoInfo differences.
Bazel 7 is slightly degraded: Kythe flags don't work, DebugContext is left out from CcInfo and temporary files generated by the C++ compiler (but it's only useful for debugging).
Tests will be submitted in separate PRs.
PiperOrigin-RevId: 674030212
Protobuf Team Bot