Description of problem:

When uploading multiple custom rules manually, MTA fails to detect them. However, if they are uploaded one by one, it does work. 

See attached video

Version-Release number of selected component (if applicable): 8.0.0

How reproducible: Always

Steps to Reproduce:
1. Create an application
2. In the analysis wizard, choose to upload rules manually and upload several at once

You can get the rules I used from https://github.com/abrugaro/book-server/tree/yaml-rules/yaml-rules