Youtube Reporting API returns video data but Youtube Data API does not for specific channel - youtube-api

Question

I have this issue where a specific channel is not returning any videos on the Data-API (see response from API below):
{
"kind": "youtube#videoListResponse",
"etag": "YIUPVpqNjppyCWOZfL-19bLb7uk",
"items": [],
"pageInfo": {
"totalResults": 0,
"resultsPerPage": 0
}
}
In the meanwhile I can see data on its videos on Reporting API, both for Combined A2 and Basic A2 report types, like below (anonymized):
date,channel_id,video_id,live_or_on_demand,subscribed_status,country_code,views,comments,likes,dislikes,shares,watch_time_minutes,average_view_duration_seconds,average_view_duration_percentage,annotation_impressions,annotation_clickable_impressions,annotation_clicks,annotation_click_through_rate,annotation_closable_impressions,annotation_closes,annotation_close_rate,card_teaser_impressions,card_teaser_clicks,card_teaser_click_rate,card_impressions,card_clicks,card_click_rate,subscribers_gained,subscribers_lost,videos_added_to_playlists,videos_removed_from_playlists,red_views,red_watch_time_minutes
20221018,CHANNEL_ID,VIDEO_ID,on_demand,not_subscribed,FR,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
The request done to Data API has the following parts specified: snippet,contentDetails,statistics,id,topicDetails (independent of parts the request yields an empty answer as well)
Channel ID: UCs5DLbzGZJ559lKPP2pEWCw
Playlist ID: UUs5DLbzGZJ559lKPP2pEWCw
Tried calling Data API with third party token, with channel's token, checked on Reporting API (there is data there but not on Data API).
I expected: that videos are listed in Data API's PlaylistItems.list edge.