cubicweb #611296 permission issue w/ rql expression on symmetric relations [open]

On our different forges, I can add some relations but cannot erase the symmetric ones due to actual permissions:

__permissions__ = {
    'read':   ('managers', 'users', 'guests',),
    'add':    ('managers', RRQLExpression('U has_update_permission S'),),
    'delete': ('managers', RRQLExpression('U has_update_permission S'),),
    }
prioritynormal
typebug
done in<not specified>
load0.500
load left0.500
closed by<not specified>