Unexpected result when using `IS DISTINCT FROM` with constants

[suyZhong]

Describe the bug
Consider the following test cases. I suppose the first query is unexpected: it should return false but not null. The query with a NOT predicate could return the expected result.

To Reproduce

SELECT ((NULL NOT IN ('a')) IS NOT DISTINCT FROM true);
-- Expected: false
-- Actual: null

SELECT (NOT ((NULL NOT IN ('a')) IS NOT DISTINCT FROM true)); -- true

Expected behavior
As mentioned above.

Screenshots
N/A

Software versions
Build from source:

> docker exec -it monetdb-test mserver5 --version
MonetDB 5 server 11.52.0 (hg id: 53f9d56) (64-bit, 128-bit integers)
This is an unreleased version
Copyright (c) 1993 - July 2008 CWI
Copyright (c) August 2008 - 2023 MonetDB B.V., all rights reserved
Visit https://www.monetdb.org/ for further information
Found 503.5GiB available memory, 128 available cpu cores
Libraries:
Compiled by: @49c6d00b8d79 (x86_64-pc-linux-gnu)
Compilation: /usr/bin/cc 
Linking    : /usr/bin/ld

Issue labeling
Bug

Additional context
Add any other context about the problem here.