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Consider this reproducer.py:
import sys
LEN = int(sys.argv[1])
with open('big_dict.py', 'w') as f:
 print('INTS = {', file=f)
 for i in range(LEN):
 print(f' {i}: None,', file=f)
 print('}', file=f)
import big_dict
assert len(big_dict.INTS) == LEN, len(big_dict.INTS)
And run it with any number > 65535:
$ python3.9 reproducer.py 65536
Traceback (most recent call last):
 File "/tmp/reproducer.py", line 12, in <module>
 assert len(big_dict.INTS) == LEN, len(big_dict.INTS)
AssertionError: 65535
This has not happened on python 3.8. This also happens with PYTHONOLDPARSER=1.