[I] pa.compute.fill_null produces unexpected result in arrow 21 [arrow]

[via GitHub]

rohanjain101 opened a new issue, #47234:
URL: https://github.com/apache/arrow/issues/47234

   ### Describe the bug, including details regarding any error messages, 
version, and platform.
   
   Arrow 21:
   
   ```
   >>> z = pa.array([True, False, False, False, False, None])
   >>> z.fill_null(True)
   <pyarrow.lib.BooleanArray object at 0x0000019E1F111720>
   [
     true,
     **true**,
     false,
     false,
     false,
     **false**
   ]
   >>> pa.__version__
   '21.0.0
   ```
   
   Arrow 20:
   ```
   >>> z = pa.array([True, False, False, False, False, None])
   >>> z.fill_null(True)
   <pyarrow.lib.BooleanArray object at 0x00000189726593C0>
   [
     true,
     false,
     false,
     false,
     false,
     true
   ]
   >>> pa.__version__
   '20.0.0'
   >>>
   ```
   
   The result in arrow 21 looks not expected.
   
   ### Component(s)
   
   C++, Python


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