2574676 - Query with UNION ALL, constant and count() returns inconsistent data - SAP IQ

The following query returns a different number of rows each time it is run.

select newevent, count(*) from 
(SELECT 'RouteExternal' as NewEvent, * FROM table1
 union all
 SELECT 'RouteExternal2' as NewEvent, * FROM table1) as test 
group by newevent

The group by means there should be 2 rows returned, but the number of rows varies from 4 up to 30 or more and is never the same twice in a row. The values of "NewEvent" are full of hex characters, strings like "buffers", "eExter", "outeEx", and so on.

newevent,count()
'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00',6568176
'\x00\x00\x00\x00\x00\x00\x00\x00(ç}À\x85\x7f',776
'èâ}À\x85\x7f\x00\x00(ç}À\x85\x7f',2309
'èâ}À\x85\x7f\x00\x00ernal2',8260
'\x00\x00\x00\x00\x00\x00\x00\x00ernal2',2023702
'RouteExternal',38954111
'RouteExternal2',30224253
'\x00\x00\x00\x00\x00\x00xt\x00\x00\x00\x00\x00\x00',6455
'\x00\x00\x00\x00\x00\x00xternal2',120180

If any of the 3 factors (the constant, the count or the union all) is removed, the query works.

SAP IQ 16

CR812231, CR 812231 CR#8122131, , KBA , BC-SYB-IQ , Sybase IQ , Problem