Fortigate external ip threats comments

Hello, I'm trying to set up threat feed (external connections) via Fortimanager (v7.0.13) for my 2 Fortigates (v6.4.12 and v7.0.15). They are in two corresponding ADOMs on Fortimanager (6.4 and 7.0). Syntax in the file according to the documentation (the same for both versions)

1.1.1.1 # This is a test

However, for version 7.0, comments are recognized correctly, but for version 6.4, they are not. (screenshots). Tell me, please, what the problem might be?