I'm on the latest version 4.0.1 of Sourcetree for Mac. I have started noticing that any new txt or json file that I add is being treated as a binary. I've confirmed the file encoding to be utf-8. Running the file -I command on one such file is shown below:

file -I package-lock.json
package-lock.json: application/json; charset=us-ascii

I've read about such issues with large files, but I'm seeing these file less than 100 bytes in size.

Is this a bug or am I missing something?

Thanks.