Jozef Hartinger, Martin Kouba.
Attached the new reproducer weld stuck conversation context.zip, that specifically tests for the wrong conversation context stucking. It confirms that there's no issue in Wildfly 8.2.0.Final, so it was actually fixed in Weld 2.2.6.Final.
Just in case, tested with Wildfly 8.1.0.Final patched to Weld 2.2.6.Final too. No issue.