Error 500 in admin only

  • I have a custom post type with 3 related meta_key + thumbnail
    and when I list in admin I get error 500
    if I remove from db the metadata all works fine
    there are 20k+ posts of that type

    no pb when editing a single post
    no pb on fronted, nor on pages and posts admin

    I have boosted memory_limit to 1024M, set max_execution_time to 0
    regenerated .htaccess

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