When Elytron JACC policy resource is defined, there is WARN logged during server shutdown:

WARN [org.wildfly.security] (MSC service thread 1-8) ELY08509: Calling any of the Policy.getPermissions() methods is not supported; please see the Java Authorization Contract for Containers (JACC) specification (section "1.4 Requirements", item 1) and the Java SE API specification for the Policy.getPermissions() methods for more information. Instead, use the Policy.implies() method for authorization checking.

This is suspicious behaviour. Customers that monitor logs for warnings have to deal with this. Setting Critical.