i.e., there is a newline after the x-sc that should not be there. Removing the newline fixes the problem.
This bug originates in the file /usr/lib/mime/packages/gnumeric lines 22-23 (should be a single line, remove newline at end of line 22). From package gnumeric.
Confirmed. Line 86-87 of /etc/mailcap reads as
application/x-sc "SC/XSpread spreadsheet"; test=test -n "$DISPLAY"; nametemplate=%s.sc
gnumeric '%s'; edit=gnumeric '%s'; description=
i.e., there is a newline after the x-sc that should not be there. Removing the newline fixes the problem.
This bug originates in the file /usr/lib/ mime/packages/ gnumeric lines 22-23 (should be a single line, remove newline at end of line 22). From package gnumeric.
Please patch accordingly.