Also called 'drag and fill'.
It's for sort lists https://help.libreoffice.org/6.1/en-US/text/scalc/guide/sorted_list.html?&DbPAR=CALC&System=Unknown%20OS and 'Sheet - Fill Cells - Series'.
Duplicate bug reporting in
113499, 143960, 143970
Can anyone translate this bug into English for me?
This is a collective bug that contains references to bugs dealing with the same topic (autofill in this case). The individual bugs are listed under "Depends on", you can see them as a list by clicking "Show dependency treee".