The Collaborative International Dictionary of English v.0.48:

Misfeature \Mis*fea"ture\, n.
   Ill feature. [R.] --Keats.
   [1913 Webster]

The Jargon File (version 4.4.7, 29 Dec 2003):

misfeature
 /mis?fee'chr/, /mis?fee`chr/, n.

    [common] A feature that eventually causes lossage, possibly because it is
    not adequate for a new situation that has evolved. Since it results from a
    deliberate and properly implemented feature, a misfeature is not a bug. Nor
    is it a simple unforeseen side effect; the term implies that the feature in
    question was carefully planned, but its long-term consequences were not
    accurately or adequately predicted (which is quite different from not
    having thought ahead at all). A misfeature can be a particularly stubborn
    problem to resolve, because fixing it usually involves a substantial
    philosophical change to the structure of the system involved.

    Many misfeatures (especially in user-interface design) arise because the
    designers/implementors mistake their personal tastes for laws of nature.
    Often a former feature becomes a misfeature because trade-offs were made
    whose parameters subsequently change (possibly only in the judgment of the
    implementors). ?Well, yeah, it is kind of a misfeature that file names are
    limited to six characters, but the original implementors wanted to save
    directory space and we're stuck with it for now.?


The Free On-line Dictionary of Computing (30 December 2018):

misfeature

   /mis-fee'chr/ or /mis'fee"chr/ A feature that eventually
   causes lossage, possibly because it is not adequate for a new
   situation that has evolved.  Since it results from a
   deliberate and properly implemented feature, a misfeature is
   not a bug.  Nor is it a simple unforeseen side effect; the
   term implies that the feature in question was carefully
   planned, but its long-term consequences were not accurately or
   adequately predicted (which is quite different from not having
   thought ahead at all).  A misfeature can be a particularly
   stubborn problem to resolve, because fixing it usually
   involves a substantial philosophical change to the structure
   of the system involved.

   Many misfeatures (especially in user-interface design) arise
   because the designers/implementors mistake their personal
   tastes for laws of nature.  Often a former feature becomes a
   misfeature because trade-offs were made whose parameters
   subsequently change (possibly only in the judgment of the
   implementors).  "Well, yeah, it is kind of a misfeature that
   file names are limited to six characters, but the original
   implementors wanted to save directory space and we"re stuck
   with it for now."