[libreoffice-users] Odd "soffice --convert-to xlsx" behaviour when called from shell script

Hi
 
If I do:

    soffice --headless --convert-to xlsx /home/me/sheets.ods --outdir /home/me/tmp

from the command line everything works fine:

    func=xmlSecCheckVersionExt:file=xmlsec.c:line=188:obj=unknown:subj=unknown:error=19:invalid 
version:mode=abi compatible;expected minor version=2;real minor version=2;expected subminor 
version=25;real subminor version=26
    convert /home/me/sheets.ods -> /home/me/tmp/sheets.xlsx using filter : Calc Office Open XML

However, if I do the same thing from a shell script

    $(soffice --headless --convert-to xlsx /home/me/sheets.ods --outdir /home/me/tmp )

I get this:
    func=xmlSecCheckVersionExt:file=xmlsec.c:line=188:obj=unknown:subj=unknown:error=19:invalid 
version:mode=abi compatible;expected minor version=2;real minor version=2;expected subminor 
version=25;real subminor version=26
    convert /tmp/magick-245771VE8simr9bq5 -> /tmp/magick-245771VE8simr9bq5.pdf using filter : 
calc_pdf_Export
0123456789012345678901234567890123456789012345678901234567890123456789
I have no idea why it should randomly decide to do anything with PDF.
Quite aside from this, the script then hangs waiting for soffice(?) to
finish, which it never* does.

    $ soffice -h | grep LibreOffice
    LibreOffice 6.0.7.3 00m0(Build:3)

* Actually, I lie. It takes a long time - way longer than it took to
  generate the xslx from the command line - but after some time ps
  can't find the soffice process any more. The shell script *still*
  doesn't continue/end, however.

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