Windows: "access denied" when creating a bug

Been testing this out. If I make a local git repo, everything seems fine, but if I clone a remote repo, and try to use it I get an error:

(in a Windows command window)

> git clone https://server/git/git_bug_test
> cd git_bug_test
> git-bug user create
Name [me]:
Email [me@fake.com]:
Avatar URL:

bbc5207b0d2ddb8b823d53052a3a77eafc996a03143c3bed99f5841c2438e921

> git-bug add -t "First Bug" -m "Bug number one!"
Error: rename E:\temp\git_bug_test\.git\objects\pack\tmp_obj_2131903459 E:\temp\git_bug_test\.git\objects\e6\9de29bb2d1d6434b8b29ae775ad8c2e48c5391: Access is denied.

I can manually edit/rename the mentioned files just fine, no locks or access limits, so maybe it something else throwing the error with a spurious message?