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The __isnull lookup of JSONField must special case Value(None, JSONField()) left-hand-side in order to be coherent with its convoluted null handling. Since psycopg>=3 offers no way to pass a NULL::jsonb the issue is resolved by optimizing IsNull(Value(None), True | False) to True | False. Regression in 5c23d9f0c32f166c81ecb6f3f01d5077a6084318. Thanks Alexandre Collet for the report. Backport of 3434dbd39d373df7193ad006b970c09c1a909ea3 from main
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