[bug-gawk] [awk 3.1.3] I have a precise problem

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hello, I found a precise problem with awk (version 3.1.3). 

 

$ awk --version
GNU Awk 3.1.3

$ echo "한글" | env 'LC_ALL=ko_KR.UTF-8' awk '{print length($0)}'
6
--> wrong...

 

but, at other version, it works fine.

 

$ awk --version
GNU Awk 3.1.5
$ echo "한글" | env 'LC_ALL=ko_KR.UTF-8' awk '{print length($0)}'
2
--> right

 

could you explain this, please?