Why is the SWAP instruction missing in Python 3.11's disassembled bytecode for tuple swaps?

Question

In newer versions, ROT_TWO is replaced by SWAP. However, after disassembling the function using dis.dis(), I noticed that SWAP does not appear in the bytecode.

Python 3.9.0

>>> import dis
>>> def foo(a, b):
...     a, b = b, a
...
>>> dis.dis(foo)
  2           0 LOAD_FAST                1 (b)
              2 LOAD_FAST                0 (a)
              4 ROT_TWO
              6 STORE_FAST               0 (a)
              8 STORE_FAST               1 (b)
             10 LOAD_CONST               0 (None)
             12 RETURN_VALUE
>>>

Python 3.11.0

>>> import dis
>>> def foo(a, b):
...     a, b = b, a
...
>>> dis.dis(foo)
  1           0 RESUME                   0

  2           2 LOAD_FAST                1 (b)
              4 LOAD_FAST                0 (a)
              6 STORE_FAST               1 (b)
              8 STORE_FAST               0 (a)
             10 LOAD_CONST               0 (None)
             12 RETURN_VALUE
>>>

Further Reading:

How does swapping of members in tuples (a,b)=(b,a) work internally?