Crash in git_diff_tree_to_index when calling Repository.RetrieveStatus

I originally raised this bug with libgit2 directly but response was that this is in fact a libgit2sharp error.
https://github.com/libgit2/libgit2/issues/5363

Reproduction steps

Use Repository.RetrieveStatus from libgit2sharp from inside Unity3D editor script.

1. download this: libgit2-git_diff_tree_to_index-Crash.zip
2. download Unity 2019.3.0f5 (other versions crash as well)
3. open the above project
4. select menu item "Git Error/RetrieveStatus - CRASH"
5. note native crash, with the log below

Expected behavior

No crash, instead returns RepositoryStatus

Actual behavior

git2-106a5f2.dll caused an Access Violation (0xc0000005)
  in module git2-106a5f2.dll at 0033:7cb4ae65.

Stack Trace of Crashed Thread 9380:
0x00007FFC7CB4AE65 (git2-106a5f2) git_diff_tree_to_index
0x00007FFC7CBB4B09 (git2-106a5f2) git_status_list_new
0x0000028C392EADBF (LibGit2Sharp) LibGit2Sharp.Core.NativeMethods.git_status_list_new()
0x0000028C392EAB9B (LibGit2Sharp) LibGit2Sharp.Core.Proxy.git_status_list_new()
0x0000028C392E57FB (LibGit2Sharp) LibGit2Sharp.RepositoryStatus..ctor()
0x0000028C392E49FB (LibGit2Sharp) LibGit2Sharp.Repository.RetrieveStatus()

Version of LibGit2Sharp (release number or SHA1)

git2-106a5f2, but also happens with e.g. git2-7ce88e6 (happened with all versions I tried).

Operating system(s) tested; .NET runtime tested

Windows 10

Bắt đầu với project tái hiện Unity đính kèm và lời gọi Repository.RetrieveStatus được mô tả trong issue. Xem xét stack crash native xung quanh git_diff_tree_to_index và git_status_list_new, sau đó xác minh trên Windows 10 rằng bản tái hiện không còn crash và trả về RepositoryStatus.