Seems to me that, before you process with a standard module, you need to eliminate instances of double-doublequotes.
E.g.
$i = 'R50R20,Desc 4-10,R400,20,Test,Test5';
$i =~ s/\"{2}/*my_special_double_quote_marker*/g;
... normal double quote processing here ...
foreach ( @cell ) {
s/*my_special_double_quote_marker*/\"/g;
}
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