Created attachment 468471 [details] test case see attached test case
Table code in general needs some work as it has some nontraditional way of running layout on its subtree (see RenderTable::layout). With c-v enabled we end up running some part of the table layout while we skip some other part, in a very inconsistent way.
<rdar://problem/117909005>
I think this bug can be closed, it does not repduce anymore after r270888.
Can't be reproduced after r270888.