Cutting and pasting now works in my PDF file. But C&P did not work in your proposed solution: I had to s/udf/utf/.
I did a little additional testing: Of the flags in your response, only the -unicodemap seems required. Although the utf8 encoding flag's functionality is clear, the other two flags do not effect embedded text.
While digging in the source code, I discovered that PDF::API2 sets -unicodemap
by default- although PDF::API3::Compat::API2 does not. Sure enough, when I went back and tested with PDF::API2, the text was embedded. Maybe this *is* a bug in PDF::API3::Compat::API2. Even so, I only encountered it trying to fix a bug I didn't have in the first place. :(