That's out of question, but my point is we have so far never seen such a huge gap between known prototypes - aka no. 01, 02 and then 05 - and the other programs in mind surely also had a static test specimen.
I don't think we have a very big sample to draw on.
For J-20 200X demonstrators, we had confirmed serials for 2001 and 2002, with 2002 supposedly possibly renumbered as 2004, but we don't know how many actual 200X demonstrators were actually built.
And for the J-20 201X prototypes, we had 2011, 2012, 2013, 2015, 2016, 2017, missing 2014.
And for other CAC aircraft or even SAC aircraft, there is nothing that is all encompassing either.
I don't really think there's any precedent or pattern here that we can argue to have to apply for J-20A.
So if the question is "where are 2053 and 2054" for J-20A, there are a few reasonable plausible explanations (combinations of static test frame/s, or choosing to skip a number, or the airframe existing and having flown but for some reason the serial just didn't have photos released to us) that are all within the scope of reality.
I suppose it's only "strange" if we have any expectations to have an accurate record of new prototypes or airframes but I have long since abandoned such hopes.