I can change schematic to look like the one above if you like, it isn’t all that difficult.
Peter
@Harald_Rau please just make sure that SDA is a different Pin on Calliope mini V3 (C20). You can see all pins here: Pins | Calliope Dokumentation
In the “BME280_Calliope_3” example you can see the assignment. I actually tested the same assignment on the Calliope Mini 3. It works excellently with it.
BME280_Calliope_3.fzz (88,5 KB)
It appears to be correct to me too (because 2 sets of eyes checking are better than one 
!) Here I grabbed the referenced document to identify which pins should be SDA:
then loaded Harald’s sketch in to Fritzing and clicked on the SDA pin on the grove connector (which will light up all connected nets in yellow) and the SDA pins all light correctly.
indicating the SDA pin is indeed internally connected to C20 as it should be so I think everything is fine too.
Peter
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Maybe the question was related to this post:
This is the old Calliope. Here are A0-SDA=C18 and A0-SCL=C19
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