Failed to upgrade sub modules when the tagged version is same as the main module

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1

This issue comes up several times.

I got two modules that tagged as same version.

Module Version
hb v0.1.2
hb/modules/meta/docs v0.1.2

The hb@v0.1.2 is released earlier than hb/modules/meta/docs@v0.1.2, which doesn’t include the docs submodule.

I got the following error when I try to upgrade to hb/modules/meta/docs@v0.1.2.

➜ hugo mod get -u github.com/razonyang/hb/modules/meta/docs@v0.1.2
go: module github.com/razonyang/hb@v0.1.2 found, but does not contain package github.com/razonyang/hb/modules/meta/docs
Error: failed to get ["-d" "-u" "github.com/razonyang/hb/modules/meta/docs@v0.1.2"]: 
failed to execute 'go [get -d -u github.com/razonyang/hb/modules/meta/docs@v0.1.2]': 
failed to execute binary "go" with args [get -d -u github.com/razonyang/hb/modules/meta/docs@v0.1.2]: go: module github.com/razonyang/hb@v0.1.2 found, 
but does not contain package github.com/razonyang/hb/modules/meta/docs
 *errors.errorString

➜ hugo mod get github.com/razonyang/hb/modules/meta/docs@v0.1.2 
go: module github.com/razonyang/hb@v0.1.2 found, but does not contain package github.com/razonyang/hb/modules/meta/docs
Error: failed to get ["-d" "github.com/razonyang/hb/modules/meta/docs@v0.1.2"]: 
failed to execute 'go [get -d github.com/razonyang/hb/modules/meta/docs@v0.1.2]': 
failed to execute binary "go" with args [get -d github.com/razonyang/hb/modules/meta/docs@v0.1.2]: go: module github.com/razonyang/hb@v0.1.2 found, 
but does not contain package github.com/razonyang/hb/modules/meta/docs
 *errors.errorString

But it’s strange that everything works fine after running go get.

➜ go get -u github.com/razonyang/hb/modules/meta/docs@v0.1.2
go: downloading github.com/razonyang/hb v0.1.2
go: downloading github.com/razonyang/hb/modules/meta/docs v0.1.2
go: upgraded github.com/razonyang/hb/modules/meta/docs v0.1.1 => v0.1.2

➜ hugo mod get -u github.com/razonyang/hb/modules/meta/docs@v0.1.2

➜ hugo mod tidy

➜ git diff | grep docs
-       github.com/razonyang/hb/modules/meta/docs v0.1.1 // indirect
+       github.com/razonyang/hb/modules/meta/docs v0.1.2 // indirect