This could be because of the disassociation of the WEB-ACL. look into cloud trial logs for disassociate-web-acl api call.
Also, there are Restrictions on multiple association
You can associate a single web ACL with one or more AWS resources, according to the following restrictions: • You can associate each AWS resource with only one web ACL. The relationship between web ACL and AWS resources is one-to-many. • You can associate a web ACL with one or more CloudFront distributions. You cannot associate a web ACL that you have associated with a CloudFront distribution with any other AWS resource type.
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