highligth excerpt not visible with attachment (using pdftotext)

Hi

i've got a problem:

when finding text on an attachment, excerpt is empty (but result is found)

i found another issues concerning this point but for solr or concerning the tokenizer

but i used pdftotext. (i selected "create excerpt" and didn't select the tokenizer)

someone does have the problem too ?

do you know a way to make it works ?