Now jmeter-java-dsl uses consistent HTTP connection behavior for every thread group, reusing connections by default between thread iterations.
If you prefer in your test plan to reset connections per iterations you can use httpDefaults().resetConnectionsBetweenIterations(true).
Check the new user guide section for additional details.
Additionally, jmx2dsl conversion of jsr223 test elements now doesn't fail.
In future versions we will improve the conversion to no longer use wrappers and make code shorter and simpler.