acro prints singular and plural

Question

I defined an acronym like this:
    DeclareAcronym{LSTM}{
      short = LSTM ,
      long  = long short-term memory,
      long-plural = long short-term memories
    }

The problem: using acp{LSTM} prints the singular and the plural form (i.e., "long short-term memorylong short-term memories (LSTMs)").
What could be the reason for it?
MVE:
documentclass{article}
usepackage{acro}
usepackage{mfirstuc}% provides capitalisewords
acsetup{
    list-long-format=capitalisewords,
      extra-style=comma,
      list-style   = lof,
      list-heading = subsubsection*,
      list-short-format={bfseries},
    only-used=false,
    list-style = longtable}
    
    DeclareAcronym{LSTM}{
      short = LSTM ,
      long  = long short-term memory,
      long-plural = long short-term memories
    }

begin{document}
    acp{LSTM}
end{document}

cgnieder · Answer

The long-plural property (and likewise the other plural properties like short-plural) should maybe rather be called long-plural-ending. Per default it has the value s and is appended to the value of long. Therefore an acronym defined like this
DeclareAcronym{LSTM}{
  short = LSTM ,
  long  = long short-term memory
}

would get the long plural long short-term memorys.  In order to get a different form you should do
DeclareAcronym{LSTM}{
  short = LSTM ,
  long  = long short-term memory,
  long-plural-form = long short-term memories
}

which would print the long plural as long short-term memories.

If you instead do
DeclareAcronym{LSTM}{
  short = LSTM ,
  long  = long short-term memory,
  long-plural = long short-term memories
}

as in your MWE then long short-term memories is appended to long short-term memory and leads to long short-term memorylong short-term memories.

acro prints singular and plural

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