ObjectDB internal error on 2.6.4.b10 for query with DISTINCT

I observed that on new ObjectDb v.2.6.4.b10 query below causes internal exception

SELECT DISTINCT $1 FROM Pa3DictionaryItem $2 JOIN $2.values $1 WHERE ($2.namespace == 'com.anritsu.pa3.ttcn3' AND $2.key == 'TliEvent' AND $1 != '')

Query above also worked fine on ObjectDb version 2.6.1.b06

Could you comment this?

Raised issue: Issue #1176 - DISTINCT key causing internal exception on 2.6.4.b10

Fixed in 2.6.5 release