Github user WeichenXu123 commented on the issue:
    I thought again, instead of "removing default value and restore it again 
later (which may cause some side effects)", maybe the better way is, add a 
parameter to `DefaultParamsWriter.saveMetadata`, specify which default param 
need to skip when saving.
    @mgaido91 Yes I agree with you. Either #20410 or #18982 need to be merged 
to 2.3, the related issue is possible to cause some strange bugs.
    cc @jkbradley 


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