related to following idea, which also provide further details:
https://community.blueprism.com/ideas/viewidea?IdeationKey=685838f9-1ad8-4ed9-b293-cc951d97904eThe idea is to change the system wide setting for browser extension port assignment to be per object/process. It should be possible to set default behavior to dynamically assigned ports but tell BP to use standard port when attaching to running browser instance.
Using standard ports when attaching to browser could be new default behavior (since it is obvious dynamic ports won't work).