test case: http://codepen.io/kgcreative/pen/LZZgxG specifying min-height: anything breaks the layout in Version 9.1.1 (11601.6.17) as well as safari for iOS. if I specify min-height: 0, the problem goes away. If I specify max height, or height, the min-height attribute overrides both of these. if I remove "column-count", the problem goes away. It seems to be specific to min-height in combination with "column-count".
Safari, Chrome, and Firefox all agree on rendering for this test case. I don't believe there is any remaining compatibility issue.