bug: git fetch reports too many unreachable loose objects

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git version 2.19.1
steps to reproduce:

# start in a brand new repo
git init

# create lots of unreachable loose objects
for i in {1..10000}; do git commit-tree -m "$(head -c 12 /dev/urandom
| base64)" "$(git mktree <&-)" <&-; done
# this prints a lot of output and takes a minute or so to run

# trigger git gc to run in the background
git fetch
# Auto packing the repository in background for optimum performance.
# See "git help gc" for manual housekeeping.

# trigger it again
git fetch
# Auto packing the repository in background for optimum performance.
# See "git help gc" for manual housekeeping.
# error: The last gc run reported the following. Please correct the root cause
# and remove .git/gc.log.
# Automatic cleanup will not be performed until the file is removed.
#
# warning: There are too many unreachable loose objects; run 'git
prune' to remove them.

# to manually fix this, run git prune:
git prune

# note that `git gc` does not fix the problem, and appears to do
nothing in this situation:
git gc


According to the `git fetch` output, the `git help gc` docs, and the
`git help prune` docs, I don't think I shouldn't ever have to run `git
prune` manually, so this behavior seems like a bug to me. Please
correct me if this is expected behavior.

In case anyone's wondering why I'm creating unreachable loose objects,
here's the usecase: https://stackoverflow.com/a/50403179/367916 . I
would love a first-class solution to obviate that workaround, but that
is probably a separate issue.

Josh



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