It's impossible to unchecked an item in Roles/Policies/Subtree or Node
Probably duplicate of https://jira.ez.no/browse/EZP-29082
I think we can treat this as a story. No need of backporting.
If a customer reports this bug we will recommend to migrate to v2.5, especially because it's an LTS.
OK Sylvain Guittard, I will implement this as a feature.
PR created: https://github.com/ezsystems/repository-forms/pull/273 (backend)
PR created: https://github.com/ezsystems/ezplatform-admin-ui/pull/799/ (frontend)