A detailed rundown of the IPCC plenary meeting is helpfully provided by Earth Negotiations Bulletin (ENB):
https://enb.iisd.org/intergovernmental-panel-climate-change-ipcc-64

"The Panel was unable to avoid the contentious debates that have characterized every session in this cycle, especially on the timeline for the production of the Seventh Assessment Report. Friction bled into consideration of other topics, including the review of the Panel’s Principles and Procedures."