Hi Donatas
SAP development have been made aware of this issue regarding the change in behaviour for
Sybase IQ 16.0 SP8. The workaround you mentioned above can be achieved by exporting the DataFlow as an ATL and changing the section <iq_blk_ldr_block_size>500000</iq_blk_ldr_block_size> to <iq_blk_ldr_block_size></iq_blk_ldr_block_size>, then reimport the ATL.
This workaround isn't ideal but can be used until a permanent fix is delivered, I will share
confirmation of this release once made available.
Regards
Charles