https://bugs.documentfoundation.org/show_bug.cgi?id=159425

            Bug ID: 159425
           Summary: ISBLANK(range)
           Product: LibreOffice
           Version: 7.6.4.1 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: [email protected]
          Reporter: [email protected]

To check a cell range for blank cells, 

 =AND(ISBLANK(C5:M5))
 =OR(ISBLANK(C5:M5))

should return if all (or any) of the cells are blank. On Excel, this works.
But in LibreOffice the above formulae always return FALSE.  :-(   To put
clearly, they do not return errors, but return a wrong result.

I am aware we can work around the issue with formulae like 

 =COUNTBLANK(C5:M5)=COLUMNS(C5:M5)
 =SUMPRODUCT(C5:M5)=COLUMNS(C5:M5)

but this makes formulae unneccessarily long, hard to read, error-prone on
edits, and less elegant.

I experienced this on the current release (see below) but the issue probably
exists for a long time, if not for every release.

Version: 7.6.4.1 (X86_64) / LibreOffice Community
Build ID: 60(Build:1)
CPU threads: 8; OS: Linux 6.7; UI render: default; VCL: kf5 (cairo+xcb)
Locale: de-DE (de_DE.UTF-8); UI: de-DE
7.6.4-2
Calc: threaded

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