I'm also receiving INVALID_ARGUMENT today, though I don't see anything about IN_USE_ADDRESSES in my deployment issues. I compared build logs between the last successful deployment and today, and the only difference I could spot is
gcr.io/gae-runtimes/go111_app_builder. The working version (as of my last successful deployment on April 20) was
go111_20200223_1_11_13_RC00. Today's version is
go111_20200412_1_11_13_RC00. I'm still unsure if the underlying issue is on my side or not.