If in doubt, use diagnostics and/or see perldiag for your error message(s):
Operation "%s" returns its argument for non-Unicode code point 0x%X
(S non_unicode) You performed an operation requiring Unicode rules on a code point that is not in Unicode, so what it should do is not defined. Perl has chosen to have it do nothing, and warn you.
To me, this means that the data you are reading is not really valid UTF-16 or valid Unicode. Please show us the relevant code that reads and decodes the data, and the relevant snippet of the data. That way, maybe we can see better where the problem originates from and make better suggestions as how to address this problem.
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