In Thai Wikipedia, we have a filter preventing creating pages which are too short. It works fine in all cases except blank page case. Examining the page creation which the filter fails to prevent, I found that the filter does detect it. It fails to prevent the creation nonetheless.
I don't know if this is a problem of MediaWiki overriding AbuseFilter, or a problem of AbuseFilter itself. Please change this bug report to the correct section when the problem is identified.
 - https://th.wikipedia.org/wiki/Special:AbuseFilter/32
 - https://th.wikipedia.org/wiki/Special:AbuseFilter/examine/7380108 ; I got green check mark when testing