https://bugs.freedesktop.org/show_bug.cgi?id=81435

          Priority: medium
            Bug ID: 81435
          Assignee: [email protected]
           Summary: Names lose reference information when copying cell
                    ranges
          Severity: major
    Classification: Unclassified
                OS: Windows (All)
          Reporter: [email protected]
          Hardware: All
            Status: UNCONFIRMED
           Version: unspecified
         Component: Spreadsheet
           Product: LibreOffice

How to reproduce:
Open the attachted example file. Press CTRL+F3 to verify that the names
“NamedField_1”, “NamedField_2” and “NamedField_3” are properly defined,
referring to $Sheet2_1.$C$3, $Sheet2_1.$C$5 and $Sheet2_1.$C$6 respectively.
In Sheet2_2 select cells A4 … C4 and copy them (Using CTRL+C and CTRL+V) into
the corresponding blank cells in Sheet2_1.

Current behaviour:
Pressing CTRL+F3 shows that  “NamedField_1”, “NamedField_2” and “NamedField_3”
now display an #REF!-Error. Despite this error, the value in Sheet2_1.C8 is
unchanged. Note that this cell refers to the names that contain the ref error.
Save and reload the spreadsheet changes the value in cell Sheet2_1.C8: It now
displays an error.

Expected behaviour:
The names should not be affected by the insertion.

I observed that copying cell ranges produces other effects too. Cells referred
to different ranges after copying some unrelated cells. Unfortunately I was not
yet able construct a situation that reliably demonstrates this behaviour.

As the correct reference information is lost, this error involves loss of data
and that's why I classified it as major error. What makes the situation worse
is that this loss of information may go unnoticed: Cell Sheet2_1.C8 remains
unchanged despite the fact the the reference information became invalid.

There are a couple of  bugs that seem somehow related to this one:
Bug 81330, bug 67581, bug 81295 and 81294.

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