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If you click on the preset entries it says explicitly denotes that the group and everyone entries will not inherit. So the preset does exactly what is shown on screen.

No, no other permissions were applied, I stripped all acl, then put new ones on there. Then applied recursively, which was my idea, because previous permissions were wrong (migrating datasets from another server). I wanted to re-set all permissions, so I stripped the ACL, then created new ones with NFS4_HOME, those did not set any group ones on all files, though it did set group perms on the main dataset. Then I switched to NFS4_OPEN and all the files did get group perms. Then switched back to NFS4_HOME, then all group permissions were gone again, so this is definitely somehting to look into.

Thank you for your report, !

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Are different permissions applied than the ones you review in the ACL form? I’m perhaps missing something here, but what generally happens is you look over what ACL is loaded on the form and then choose whether to apply it. If you apply permissions recursively, they will make recursive changes.