Authors of lists with filter sets can organize performance of their code in context of web-sites that user opens through adding lines with “rewrite” operator that makes substitution of URL-part. Rewrite operator does not enable substituting of a host in URL though allows freely manipulate with inquiry arguments. Substitution by tags as script, object and subdocument is blocked but text can be used for replacement.
Fixing of an issue is on a preparatory stage. Adblock and uBlock also encounter this problem.
Adblock Plus developers assess possibility of real attacks as low as they censor all changes in service rules list and seldom practice connection of side lists.