Effect of a Lindlar catalyst on an alkene?

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    Alkene Catalyst
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Lindlar's catalyst facilitates the syn addition of hydrogen to alkynes, stopping at the alkene stage. When applied to a molecule containing both an alkyne and an alkene, the alkene remains unaffected due to the catalyst's selective activity. The catalyst is specifically poisoned to prevent further reduction of double bonds, ensuring that the alkene does not convert to an alkane. This characteristic makes Lindlar's catalyst useful for selectively hydrogenating alkynes without altering existing alkenes in the same molecule.
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I know a Lindlar catalyst will cause syn addition of hydrogens to an alkyne and then stop at an alkene, but what about a molecule that has both an alkyne and an alkene in it to start. Is the alkene taken to an alkane or is it simply not affected? Thanks for your answers.
 
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Lindlar's catalyst is poisoned so that it do not reduce the double bonds furthur into single bond.
 

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