This issue happens while using XEM, but I`ve been told that wikiManager uses the copy methods that should take care of it.
How to reproduce (global admin everywhere):
1. Create a blank wiki template
2. Import XE xar in the empty template as non-backup import (having global admin as last modifier)
3. Create a new wiki using the template
4. Go to Main.Dashboard in the new wiki and see that wiki macros are not working.
It seems that the copy wiki operation does not properly register wiki macros in the destination wiki.