ajaxSingle does NOT limit the set of data sending to the server, but limit the data that is processed there.
So, it works like designed.
Ok, I implied that because of this sentence in tld documentation:
ajaxSingle: if "true", submit ONLY one field/link, instead of all form controls
Some of my form fields may have large content so I guess only workaround is to put suggestion box in separate form.
I appreciate your help
Ohh, thank you for pointing out on the oldest bug in the documentation.