|   | 1 |  initial version  | 
That's a bug, indeed. I opened https://trac.sagemath.org/ticket/34597
|   | 2 |  No.2 Revision  | 
That's a bug, indeed. I opened https://trac.sagemath.org/ticket/34597
for matrices over cyclotomics a multi-modal algorithm is used, and it fails here. :-(
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                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.