Council of Elrond

Mischief in a Mean Way wrote:Playable during the site phase on a Border-hold site if you have 10 or more stage points. This site becomes one of your Wizardhavens [W] and loses all automatic-attacks. Nothing is considered playable as written on the site. If one of your companies is at this site, all attacks against it are canceled. Other Fallen-wizards may not use this site as a Wizardhaven [W]. Discard this card when the site is discarded or returned to its lacation deck. It cannot be discarded otherwise.

CRF, Rulings by Term, Site" wrote:A permanent-event played on a site affects only the copy of the site it is played on,
unless otherwise specified. A permanent-event not played on a site affects all versions
of affected sites.

Underline mine.

So "Other Fallen-wizards may not use this site as a Wizardhaven [W]." does not prevent other Fallen-wizards from using their versions of the site as a Wizardhaven [W].

I propose the following erratum:

Playable during the site phase on a Border-hold site if you have 10 or more stage points. This site becomes one of your Wizardhavens [W] and loses all automatic-attacks. Nothing is considered playable as written on the site. If one of your companies is at this site, all attacks against it are canceled. Other Fallen-wizards may not use any versions of this site as a Wizardhaven [W]. Discard this card when the site is discarded or returned to its lacation deck. It cannot be discarded otherwise.

I disagree with the premise as discussed with respect the Hidden Haven. The proposal misunderstands how the CRF works.

The CRF ruling that is supposed in conflict is a Ruling by Term. The CRF specifically states "The Turn Sequence and Rulings by Term sections are specifically considered clarifications to the rules, and are therefore overridden by card text that specifically does so."

Mischief in a Mean Way specifically overrides the CRF ruling on "sites."

I don't think this issue is contested.