Less is more
A stated in other Smalltalk blog, less is more. And that was the case with the suspended processes left when running Seaside on Dolphin, to fix it I had to "remove" code, not to add.
Removing one method send in Continuation>>#value:, everything started to work as expected.
The only thing remaining is the reference to some dead processes of Swazoo (HTTPConnection>>#interact) by some handlers of Seaside, once done, Seaside on Dolphin will rock!