With the introduction of the newer versions of golang >1.18 imported modules should have a go.mod file to define the language setting.
When using the new generated protobuf files, the opi-xxx-bridge code examples were failing with the newly generated files due to predeclared types which required newer versions of go. If a module doesn't have a go.mod definition with the language setting specified, it will default to 1.16. Many of the new declarations are not supported in 1.16 and the compile will fail.
Adding a go.mod file to the specific modules is required.