git fast-export not preserving executable permissions?

Hello Git world!

I have run into an issue that I cannot seem to resolve with git fast-export. When running a fast-export on a repo that contains scripts with executable permissions (e.g. a gradlew script), the resulting export does not properly reflect the executable permissions on the script files.

To illustrate this issue, I created a small sample repo, with one executable file and one non-executable file. From the output below, you can see that the mode in the output from fast-export is the same for both files; according to the documentation for fast-import, the mode for the executable file should be 100755 instead of 100644.

    $ ls -gG
    total 2
    -rwxr-xr-x 1 106 Apr 29 09:13 executable_script.sh*
    -rw-r--r-- 1  63 Apr 29 09:12 non_executable_file.txt

    $ git fast-export --all
    blob
    mark :1
    data 106
    #!/bin/bash

    # This is a shell script that should be executable.
    echo 'The script executed successfully!'

    blob
    mark :2
    data 63
    This file is a simple text file that should not be executable.

    reset refs/heads/dev
    commit refs/heads/dev
    mark :3
    author Doug <41mortimer@gmail.com> 1588167102 -0400
    committer Doug <41mortimer@gmail.com> 1588167102 -0400
    data 25
    Adding some sample files
    M 100644 :1 executable_script.sh
    M 100644 :2 non_executable_file.txt

Please let me know if there is any further information I can provide about this issue.

Thank you, Doug