How to repeat:

• go to Configuration -> Discovery
• add new rule
• add snmpv3 check with authPriv security level
• leave MD5 / DES radio buttons untouched
• save rule
• open rule again
• MD5/DES buttons are grayed and unselected, it's not possible to update rule

this is because jquery changed code from attr() to prop() call, and, for discovery, code

if (radioObj.attr('type') == 'radio') {
	radioObj.removeAttr('checked');

	jQuery('#' + name + '_' + itemObj.val()).attr('checked', 'checked');
}

should be remade to

if (radioObj.attr('type') == 'radio') {
	radioObj.prop('checked', false);
	jQuery('#' + name + '_' + itemObj.val()).prop('checked', true);
}

we should also test if some other parts of the code are affected.