This is yet another modification on crappy windows applications like Flexible Lies Manager. This is neither Debian nor GRUB bug, but of the windows application which improperly writes to MBR gap. However this is a relatively widespread issue, so in upstream we now write that part using Reed-Solomon so we're not affected by this misbehaviour other than the time needed to recover from corruption in Reed-Solomon.
-- Regards Vladimir 'φ-coder/phcoder' Serbinenko
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