Space List Heading disappeared

A customer opened an Atlassian Answer and he described that after upgrading from 5.6.5 to Confluence 5.7.5, the heading(title) of the Space List macro has disappeared.

I've tested with the latest version(5.8.5) and the heading is still missing.

I've tested with the 5.6.6 and the heading is appearing, so it must be related with the 5.7 version and later.

Steps to reproduce:

1. Create two or more spaces
2. Add the Space list Macro
3. Select any Scope of Spaces(don't leave it blank)