XenForo Strange incident: Enabling a route filter caused 404 errors somewhere else – Problem with XF caching?

[nocte]

I begin with a short summary of the incident:

Recently I activated a route filter for the new “Knowledge Base System” add-on by @Bob. Then I got some user reports, that reactions in DMs don’t work: trying to react gave a 404 error. After I deactivated the route filter, the problem was immediately gone. This is proven by the server logs (we checked the 404 errors).

Now, the interesting part: Re-activating the route filter did not re-trigger any 404 errors. I am simply...

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