In #5433 I reported that Turkish undotted-i (ı, U+0131) was not getting converted to the expected ascii equivalent. This was subsequently fixed in #5434.

At some point this regressed. It may have been some time ago, but at least testing now in 2.17.1.1 I get a dropped character again.

# Actual
$ pandoc -f markdown+ascii_identifiers -t native
[ Header 1 ( "isk" , [] , [] ) [ Str "I\351\305k" ] ]

# Expected
$ pandoc -f markdown+ascii_identifiers -t native
[ Header 1 ( "isik" , [] , [] ) [ Str "I\351\305k" ] ]