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If separate regions are contained in parents with different opacity settings, and flow content has its own opacity setting, breaking that content across region boundaries does not fit the current rendering model which renders each transparent item as a unit. Some description of how content breaking affects filtered and transparent content should be added to either css3-regions or css3-break.
(from http://lists.w3.org/Archives/Public/www-style/2012Feb/0069.html) roc: It might be possible to address the problem by somehow saying that each region renders an independent copy of the content flowed into the region. Then an element that's a stack context but split across regions would split into stacking contexts within each region. Or something like that.
*** This bug has been marked as a duplicate of bug 15827 ***