stem doesn't fit in beam

[Peter Terpstra]

~ .ly snippet:

        \relative c' 
% Treble
<<      { \LeftHandLeft
                <d='-4>4. e8 <f-1>4 |
                e4 \acciaccatura { cis[ d ] }  cis <a-2> 
                }
% Bass
\\      { \LeftHandLeft
                <a,=-2 d,>2 <d, a' d>4 |
                a2.
        }
>>
~~ End .ly snippet

Its about the acciaccatura, there should be something wrong with the bracket
but i don' know what.

Kind Regards,

   Peter

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