Go mod invalid version: unknown revision

[NilsJPWerner]

What version of Go are you using (go version)?

$ go version
go1.14.5 darwin/amd64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/conferencemac/Library/Caches/go-build"
GOENV="/Users/conferencemac/Library/Application Support/go/env"
GOEXE=""
GOFLAGS="-mod=vendor"
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GONOPROXY="github.com/eoch-github*"
GONOSUMDB="github.com/eoch-github*"
GOOS="darwin"
GOPATH="/Users/conferencemac/go"
GOPRIVATE="github.com/eoch-github*"
GOPROXY="direct"
GOROOT="/usr/local/Cellar/go/1.14.5/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.14.5/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/conferencemac/Code/go/bet-loop/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/05/77c57qt56jv_qnkmqh1z8zp40000gn/T/go-build130504489=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

go mod vendor go: github.com/xyz/x@v1.0.3 requires
github.com/xyz/y@v1.0.0 requires
github.com/xyz/x@v0.0.0-20200513160722-61d1c48def76 requires
github.com/xyz/y@v0.0.0-20200504191321-8daf8192493e requires
github.com/xyz/x@v0.0.0-20200319170918-0d96343df272: invalid version: unknown revision 0d96343df272

What did you expect to see?

The go mod succeeds

What did you see instead?

I have two programs that have dependencies on each other. One of them seems to have a commit that has gone missing from a few months ago. Because they depend on each other it seems to be impossible to get rid of this historical dependency. How can I get out of this circular dependency?

Each side depends on a client package in the other. That client code has no dependencies. One of them is on a non-master branch as well

[bcmills]

See http://golang.org/wiki/Resolving-Problems-From-Modified-Module-Path#a-harder-problem-removing-trailing-history.

[gopherbot]

Timed out in state WaitingForInfo. Closing.

(I am just a bot, though. Please speak up if this is a mistake or you have the requested information.)