Version 2.27.1-1 of rust-protoc-rust is marked for autoremoval from testing on Wed 04 Jun 2025. It depends (transitively) on rust-protobuf, affected by #1103833. You should try to prevent the removal by fixing these RC bugs.
A new upstream version is available: 3.0.0-alpha.2high
A new upstream version 3.0.0-alpha.2 is available, you should consider packaging it.