Choosing new column for sorting in table does not work

Hi, I am using some tables and on one of them I changed the order of columns and wanted to change the inital sorting column.
But when I try to change the column I see this:
grafik
The table data is set like this:

Am I missing sth. or ist it indeed a bug?

Nevermind!

I just triggered the action behind manually and I could choose the column.

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