This seems to be an older bug; on my system (4.5.3 2550; XPp) it only appears at the last line of the text if the length of the replacement string differs from the searched string. I.e. replacing "a" with "b" or "azerty" with "012345" are ok; Also other replacements (except of "\n" etc.) work somehow, if there is a blank line at the end of the file (or a line with text not matching the searched string).
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