[Pharo-project] AST-Core for Pharo and Squeak?

Hi guys, I've noticed a different behavior relating the RBParseTreeSearcher between Pharo and Squeak, using AST-Core-lr.33, the following code: | rbMethodNode | rbMethodNode := RBParser parseMethod: 'test [ ]'. ( RBParseTreeSearcher new matches: '`{:node | node isVariable }' do:[: aNode : answer | answer add: aNode; yourself ] ) executeTree: rbMethodNode initialAnswer: Set new. gives an empty Set in Pharo-Core (#11072) and a Set(RBSequenceNode()) in Squeak 3.10.2 Does anybody know if I should use a different AST-Core version for Squeak? An alternative repository maybe? Hernán