[rules-users] inconsistent behaviour with 'not' keyword

[techy]

Hello
Simplified version of my rule is given below.  Since I want to run this rule
once once, I control it using Bar() fact.
This rule fired inconsistently(i.e sometime it fired, sometime it is not). I
could not also reproduce. Does anybody have the clue for this? Thanks for
the help.

rule "run once"
list : ArrayList(size > 0)  from collect(Foo())
not Bar()
then
insert(new Bar());
end
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