Using drools with time based rules and saliance, the saliance is not used when firing the rules

This only happens when multiple objects update at the same time.

e.g. Rule 1 is
salience 1000
dialect "mvel"
when
$i : Item(val==10)
Item(val==11, this after [0s, 1m] $i)

Rule 2 is
salience 1000
dialect "mvel"
when
$i : Item(val==10)
not( Item(val==11, this after [0s,1m] $i))

Rule3 is
salience 100
when
$i : Item(val==11)

Then we insert 3 items with val==10
Rule2 is activated 3 times...
Then we insert an item with val==11

Note, with a val==10 and val==11 in the memory, Rule 1 will activate, and Rule 3 will activate
However, Rule1 should fire first.. as its saliance is high

For the first item it does, but then the Rule 3 fires before 2nd item does.

Audit log is attached, but summary is

Object inserted (1), Item: val==10
Activation created: Rule 2 (1)
Object inserted (2), Item: val==10
Activation created: Rule 2 (2)
Object inserted (3), Item: val==10
Activation created: Rule 2 (3)
Object inserted (4), Item: val==11
Activation created: Rule 1 (1)
Activation created: Rule 1 (2)
Activation created: Rule 1 (3)
Activation created: Rule 3 (4)
Activation cancelled: Rule 2 (1)
Activation cancelled: Rule 2 (2)
Activation cancelled: Rule 2 (3)

.. here we have 4 activations, 3 for Rule1 (saliance 1000), 1 for Rule3(saliance 100)
Activation executed Rule 1 (1)
Activation executed Rule 3 (4) //WRONG
Activation cancelled: Rule 1 (2)
Activation cancelled: Rule 1 (3)
Activation created: Rule 2 (2)
Activation created: Rule 2 (3)

Note, this works fine in Drools 5.0
In Drools 5.2.0 CR1 a null pointer is thrown (another issue will be logged for that)