We use a patched version of protobufJs with a stricter version of the lookupType function
Our strict version fails, for example, when using
root.lookupType('StringValue') instead of root.lookupType('google.protobuf.StringValue')
Why did we create this patch? because otherwise it allowed invalid proto files that protobufJs would parse correctly while other tools won't.

In one of your latest releases, you introduced this change:
https://github.com/googleapis/gax-nodejs/pull/1070/files#diff-bc32e28b99aecd547a9a9d5fe123b7a41096b4f798f4b01d03c049bd1148cd33R66
(Line 66 is the important one) where a lookup for 'ErrorInfo' is made instead of the full type name 'google.rpc.ErrorInfo' (just like it is done in the lines above it).

This change fails on our side because the patched protobufJs version is used in runtime. Any chance to see a fix on your side which uses the correct full name of the type instead of just ErrorInfo?