ACL filtering via advice unexpectedly initializes proxies

[arteymix]

Entities to be removed are collected in a HashSet in CollectionFilterer (from gsec), which triggers proxy initialization. A solution would be to use some kind of identity HashSet.

This logic is currently part of Spring Security. I'll review if they have already addressed this issue.

[arteymix]

The issue is still present to this day... https://github.com/spring-projects/spring-security/blob/main/acl/src/main/java/org/springframework/security/acls/afterinvocation/CollectionFilterer.java

[arteymix]

Reported in spring-projects/spring-security#13645