Fix commit-graph v1 regression in v2.55.0#954

dscho wants to merge 2 commits into

microsoft:vfs-2.55.0microsoft/git:vfs-2.55.0from

gitgitgadget:kk/commit-reach-find-all-fixgitgitgadget/git:kk/commit-reach-find-all-fixCopy head branch name to clipboard