Conversion from duffus to tlo does not handle diacritics correctly

[kbseah]

parsetc version
parsetc 0.4.1
lark 1.1.9
unicodedata unidata_version 13.0.0

How did you install parsetc?

• Using pip install from PyPI
• Using pip install . from cloned repository, if so, which branch and commit? master 75b10b4
• Other: please describe

Describe the error
cat examples/teochew.duffus.txt | parsetc -l Teochew -i duffus --all

• parsetc command crashed with an error:
• Output romanization is wrong

tlo	lâi-sî pêh-be2 kua3 kim-uann1
duffus	lâi-sî pėh-be2 kua3 kim-uaⁿ1

Input text

lai5-si5 peh8-be2 kua3 kim1-uaⁿ1

Expected output

lâi-sî pêh-bé kùa kim-uann

Additional information