Re: Sorting problem with Unix sort(1) with UTF-8 punctuation characters - locale issue

I've been sorting punctuation characters on one Unix system and it
did not produce the expected result. Switching to another system did
it as expected.
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The test program (it contains non-ASCII middle-dot characters) was
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sort -t $'\t' <<EOT

One hypothesis was that it's some locale issue. So I've copied the
LC_* settings to the newer system and disabled them one by one.
Strangely, the one that was responsible for the effect was LC_TIME!
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On the correct sorting system it was defined as
 LC_TIME=de_DE.UTF-8@isodate
and the one that worked improperly had
 LC_TIME=de_DE.UTF-8
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Now I'm puzzled in many ways...
If anything, I'd expected LC_COLLATE to have an effect on sorting.
Then there's no locale with @isodate on that sort-defunct system.
And clearing that LC_TIME locale or removing the "@isodate" part
did not change anything; it needs that setting to a non-existing
locale file to work correctly on the otherwise not correctly
sorting system.
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Does anyone have an idea what's going on here?
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I'm reluctant to globally set  LC_TIME=de_DE.UTF-8@isodate
(since there is no file with that name in the locale directories).
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Thanks.
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Janis
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[*] Lines with additional other contents than the depicted payload
were sorted correctly.