Steps to reproduce:
1. Go to Control Panel > Site Templates
2. Add a new Site Template "My Site Template"
3. Go to Pages > Logo and add a new logo
4. Go to Control Panel > Sites
5. Add a new site "My Site" based on "My Site Template"
The logo is propagated to the new site, so it's visible under Pages > Logo
The logo is not propagated to the site. Pages > Logo displays the default logo.
The server log shows this error: