Ligature issue when converting PDF to text

I am having a ligature issue with this PDF. 'fi', 'fl' and 'ff' characters are returning NULL

#598 is similar to this issue.

MVCE: Code + PDF

from PyPDF2 import PdfReader

reader = PdfReader("Inspection_redacted.pdf")
for page in reader.pages:
    print(page.extract_text())

PDF