Attribute (active_entities) does not pass the type constraint because:
+ Validation failed for 'Entities' with value ThreeD::Entities=HASH(0x
+6011b0a80) at constructor ThreeD::Model::new ...
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So, I changed the constraint to

   has 'active_entities' => (isa => 'ThreeD::Entities',
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and...

No more errors! (The output is still different, as it says DEBUG 2b, not 2a.)

Update: Why does it work? has is a Perl subroutine, it doesn't run at compile time. You need to actually run the code at runtime for it to have effect.

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
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