Regression No Unicode mapping with Identity-H font

In v2.0.16 or v2.0.17 running the following code. The expected output is obtained in v2.0.15 and earlier.

PDFTextStripper stripper = new PDFTextStripper();
PDDocument doc = PDDocument.load(new File("KR1020067006547.pdf"));
stripper.getText(doc);

results in errors like the following and missing characters

Sep 27, 2019 11:49:37 AM org.apache.pdfbox.pdmodel.font.PDType0Font toUnicode
WARNING: No Unicode mapping for CID+17679 (17679) in font LHXXBJ+¹ÙÅÁ-Identity-H
Sep 27, 2019 11:49:37 AM org.apache.pdfbox.pdmodel.font.PDType0Font toUnicode
WARNING: No Unicode mapping for CID+16131 (16131) in font LHXXBJ+¹ÙÅÁ-Identity-H
Sep 27, 2019 11:49:37 AM org.apache.pdfbox.pdmodel.font.PDType0Font toUnicode
WARNING: No Unicode mapping for CID+14802 (14802) in font LHXXBJ+¹ÙÅÁ-Identity-H

This change is likely related to PDFBOX-4549