Discrepancy in output length with special characters about coreutils HOT 4 OPEN

I can't reproduce this issue locally. GNU wc returns the same result as uutils wc:

$ echo "mÃ" > /tmp/a
$ cat /tmp/a | /usr/bin/wc -L -l
      1       2

from coreutils.

try with a different local ?
like with LANG=C ?

from coreutils.

I tried LC_ALL=C, LANG=C and LC_COLLATE=C, but no difference. And based on the doc of -L I would expect it to return 2 (and not 1) because there are two characters.

from coreutils.

@sylvestre Do you still have the file somewhere? I suspect that this is just an encoding issue, because I can't reproduce it either. For reference, here's my /tmp/a:

$ hexdump -C /tmp/a
00000000  6d c3 83 0a                                       |m...|
00000004

from coreutils.