In practice that's true, but it's not consistent with FAR 91.131.
§ 91.131 Operations in Class B airspace.
(a) Operating rules. No person may operate an aircraft within a Class B airspace area except in compliance with § 91.129 and the following rules:
(1) The operator must receive an ATC clearance from the ATC facility having jurisdiction for that area before operating an aircraft in that area.
The FAA is the entity that controls which ATC facility or facilities have jurisdiction over any particular airspace. Based on their actions, it's evident that the agency has decided that the ATC facility that issues your IFR clearance has jurisdiction over any class B airspace involved, no matter how far away it is, and I, for one, am not going to try to talk them out of that.
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