FWIW, I'm not experiencing either of the issues Calleja is mentioning; also on 5.4.2, though not using the cover mode. Calleja, are you using the stock Amazon Paperwhite case, or another brand? I ask because I found that an off-brand case I had experienced similar issues to yours well before the jailbreak & screensaver hack were added. The Amazon branded case, on the other hand, has never had that issue, even after the hack was installed. Having done some experimenting, it seems that the strength of the magnet used was at fault, though it was in the same position on both cases.
(Figured it's best to eliminate a potential hardware issue before assuming it's a bug.)
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