Having some troubles with ascan - version 4.61 and version 4.64 of kix32.exe behaves differently

$a="1","","2","3","","5","6","7","8","9","10"
? Join( AScan($a,"9",,,3) , ",")

Version 4.61 of Kix32.exe Returns : 9 (correct)
Version 4.64 of Kix32.exe Returns : 1,4,9 (wrong)

Edited by Mart (2014-12-03 12:09 PM)
Edit Reason: Moved post from Beta to Basci scripting as it is not related to the original question in the Beta section