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This is a candidate for a future release
The change you are seeing is because of this change listed in table 1 in the referenced KC topic: :
TCB Is the TCB always a process? Description
L8, L9, X8, and X9 open TCBs No If applications running on open TCBs use USS APIs, then a process is associated with the open TCB. The process is removed when the
open TCB is freed from the CICS task and returned to the dispatcher pool.
The change was made because the LE mechanism thats runs at at rununit_termination does not have enough state information to know if the current rununit was the one that caused the dubbing. This meant previous the USS process was not terminated and left associated with the open TCB. CICS now manages the release of USS processes from X8, X9, L8, and L9 TCBs when the TCB is released from the CICS task and returned to the relevant CICS dispatcher pool of open TCBs.
A open TCB will get dubbed if it uses Unix system services. The process will be freed when the open TCB is released by the CICS task, which for X8 and X9 TCBs used for C xplink programs is at program link level return and for L8 and L9 TCBS is at end of CICS task.