Calls to endpoint https://api.propublica.org/congress/v1/117/House/committees.json (with proper authentication) yields results with null chair, chair_id, chair_party, chair_state, chair_uri, ranking_member_id fields for all committees.
Partial result....
"status":"OK",
"copyright":"Copyright (c) 2022 Pro Publica Inc. All Rights Reserved.",
"results":[
{
"congress": "117",
"chamber": "House",
"num_results": 23,
"committees": [
{
"id": "HSHA",
"name": "Committee on Administration",
"chamber": "House",
"url": "https://cha.house.gov/",
"api_uri":"https://api.propublica.org/congress/v1/117/house/committees/HSHA.json",
"chair": null,
"chair_id": null,
"chair_party": null,
"chair_state": null,
"chair_uri": null,
"ranking_member_id": null,