Focus Theme Thread Icons not Displayed

[Unknown98]

I was asked to report this issue on these forums - 

I have an issue with the thread icons not displaying properly, for example the lock icon for a locked thread or these icons:

If a user specifies a custom thread icon it is displayed however. See screenshot:



I did upgrade to version 11 but that didn't solve the issue. 

1. Your browser - Chrome, also tried Firefox and Safari
   
   
2. Device - Macbook Pro High Sierra 10.13.5, PC Windows 10
   
   
3. Where you are getting the issue - /forumdisplay.php
   
   
4. How to reproduce the issue - 
   

MyBB version is 1.8.17.

Let me know if you need more info.