Staging modified files with paths longer than 260 characters in SourceTree sometimes stages the file as 'Removed'

Summary

Staging modified files with long paths in SourceTree sometimes stages the file as 'Removed'.

Environment

SourceTree 2.0.19.1, 1.9.6.1

Steps to Reproduce

1. Download attached repo: TestForAtlassian-2016-11-04.tar
2. Unzip, and add the repository in ST
3. Open repository and go to File Status tab
4. You will see a staged file that is marked as 'Modified'
5. Click Stage all

Expected Results

File gets moved to 'Staged' and remains 'Modified'

Actual Results

File gets moved to 'Staged' but shows as 'Removed'