Incorrect result set with using isnull() function in IQ 16

Hi team,
We have IQ 16 on HP UX.
When we use isnull() function in where clause we get incorrect result set if we do not use column name in the result set.
In first select we get result with one row but in second one we get an empty result set.
select ID, dat_start, dat_end, dat_stop
from table_test
where ID=1105935925
and isnull(dat_stop,dat_start) <> dat_end
select ID
from table_test
where ID=1105935925
and isnull(dat_stop,dat_start) <> dat_end
It depends on number of row or volume of data in table, It is possible to use option Revert_To_V15_Optimizer to get the correct result.
Do you have any different idea how to solve it?
Thanks Milos.

We have tested two versions:
Sybase IQ/16.0.0.653/131122/P/sp03/ITANIUM/HP-UXi 11.31/64bit/2013-11-22 01:49:18
SAP IQ/16.0.0.807/140507/P/sp08/ITANIUM/HP-UXi 11.31/64bit/2014-05-07 21:11:45
Both versions have given same mistake.
We have not opened any support case for this issue because it is data depended issue. It is not easy to simulate it as an example.
Do you think we should open a support case for it?
Miloš

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