That's cause 054Bs are another case of 052C or original 054s while 09V is suppose to be the next big thing.
The "next big thing" doesn't necessarily clash with continuing the 093B-class with a 2nd batch, especially when the first or first two 095 SSN(s) can be considered as pilot unit(s) for the class, and that the PLAN desperately needs more hulls in the water in case of any potential contingencies.
Besides, can't blame the PLAN if they've decided to be conservative and/or cautious with what could be the chance for them to firmly close the distance, if not finally catch up with the USN in the underwater domain, particularly with the SSN(X) pretty much stuck until the early-2040s and the latter having to order further blocks of Virginia SSNs.
Moreover, the Guancha Gang also mentioned something about the improved variant of the 095 SSN, i.e. 095A which is currently in development. So there's that.