Schedule Orders program bulk processing work with custom ATP code

We have custom ATP code called in our client environment with the use of ATP hook. This ATP hook call is correctly made when the Schedule orders program running in normal mode but runs for long time. But when we use the Bulk processing mode in this Schedule Orders program, we see that is not calling ATP hook for all the lines and finds many lines failed to get scheduled. Some unexpected errors also witnessed in the schedule orders program log file which ran under bulk processing.

I see this bulk processing has been introduced as a performance improvement in this program in R12.2.6 and could not find much information about this in user guide. Is there any way to make this bulk processing work well with the ATP hook call? Please help.