Steps to reproduce:
- Get yourself blocked/use a VPN. English Wikipedia blocks open proxies/VPNs very aggressively. So it is safe to assume that any VPN/open proxy IP is blocked there.
- Visit a article and try to edit it. (eg. https://en.m.wikipedia.org/wiki/Re:Zero_%E2%88%92_Starting_Life_in_Another_World)
The block message is not displayed properly because it contains wikitext template. The raw wikitext is displayed instead and not the output.
|The block message on the mobile site||The block message on the desktop site|
By the way, the template in question is https://en.wikipedia.org/wiki/Template:Colocationwebhost.