No url found for submodule path 'cmd/sync/temp' in .gitmodules

cmd/sync/temp seems to be marked as submodule but not referenced in .gitmodules:

$ git ls-files --stage | grep 160000 160000 e7fae18afc846033405f9b294d11e49593f427f3 0 cmd/sync/temp $ git submodule status fatal: no submodule mapping found in .gitmodules for path 'cmd/sync/temp'

this causes our build to fail.