Accumulate over declared windows doesn't work

1- compliation error :

declare Order
@role(event)
@timestamp (timestamp)
@expires( 2m )
end

rule "3 successives BUY Orders of same Quote"
when
$q : Quote()
$list : List( size == 3 ) from collect ( Order( orderType == OrderType.BUY , quote == $q.symbol )
over window:length(3)
from entry-point orderStream )
then
System.out.println(drools.getRule().getName());
$q.setPrice($q.getPrice()+0.01);
for ( Object $o : $list)

{ System.out.println("Retracting "+$o); delete($o); }
end

I am getting following compilation error with this rule, reproducer here [1]

Caused by: java.lang.IllegalStateException: src/main/java/com/redhat/quotegame/processors/RulesFDF3DF171AA07357C5FA6AC5D133F4BE_rule___3_32successives_32BUY_32Orders_32of_32same_32Quote.java (37:94) : method accumulate in class org.drools.model.DSL cannot be applied to given types;
required: org.drools.model.view.ViewItem<?>,org.drools.model.functions.accumulate.AccumulateFunction,org.drools.model.functions.accumulate.AccumulateFunction[]
found: org.drools.model.functions.accumulate.AccumulateFunction
reason: cannot infer type-variable(s) T

2- runtime error :

declare Order
@role(event)
@timestamp (timestamp)
@expires( 2m )
end

rule "3 successive BUY Orders of the same Quote"
when
$q : Quote()
$list : List( size == 3 ) from collect ( Order()
over window:length(3)
from entry-point orderStream )
then
System.out.println(drools.getRule().getName());
$q.setPrice($q.getPrice()+0.01);
for ( Object $o : $list){ System.out.println("Retracting "+$o); delete($o); }

end

Now, with this rule, I am getting the following runtime error, reproducer here [2]

org.jboss.resteasy.spi.UnhandledException: java.lang.ClassCastException: org.drools.core.common.DefaultFactHandle cannot be cast to org.drools.core.common.EventFactHandle

[1] - https://github.com/snoussi/kogito-cep-example/tree/BuildException
[2] - https://github.com/snoussi/kogito-cep-example/tree/RuntimeException