Steps to recreate:

• Go to https://patchdemo.catalyst.wmcloud.org/
• Create a wiki
• Click "go to wiki"

Expected:

Navigates to the wiki at, e.g. https://patchdemo.catalyst.wmcloud.org/wikis/6307c7f88e/w

Actual:

Navigates to the wiki at, e.g. https://patchdemo.catalyst.wmcloud.org/wikis/w