git 2.11.0 error when pushing to remote located on a windows share

After updating git from 2.10.0 to 2.11.0 when trying to push any changes to a repo located in a windows share, the following error occurs:

$ git push origin test
Counting objects: 2, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (2/2), 284 bytes | 0 bytes/s, done.
Total 2 (delta 1), reused 1 (delta 0)
remote: error: object directory /path/to/dir/objects does not exist; check .git/objects/info/alternates.
remote: fatal: unresolved deltas left after unpacking
error: unpack failed: unpack-objects abnormal exit
To //path/to/dir
 ! [remote rejected] test -> test (unpacker error)
error: failed to push some refs to '//path/to/dir'

No error occurs if pushing to the same repo (a direct copy into a local directory) using 2.11.0.

$ git push local_test test
Counting objects: 2, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (2/2), 284 bytes | 0 bytes/s, done.
Total 2 (delta 1), reused 1 (delta 0)
To C:/path/to/dir
 * [new branch]      test -> test

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git remotes:

$ git remote -v local_test C:/path/to/dir (fetch) local_test C:/path/to/dir (push) origin //path/to/dir (fetch) origin //path/to/dir (push)

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Using `git fsck --full` in both 2.11.0 and 2.10.0, it doesn't reveal any additional problems.

$ git fsck --full Checking object directories: 100% (256/256), done. Checking objects: 100% (2710/2710), done.

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I'm not sure if it's related but ` object directory /path/to/dir/objects does not exist` doesn't contain an expected second slash.

    Thomas 'Panda' Attwood.