I got replay from Zoom:
" I totally understand your concern. Our team is currently aware of issues with users joining Zoom meetings and webinars using Zoom’s web client. In the interim, we recommend downloading and installing Zoom from zoom.us/download to connect to your meeting.
We are working on it and will post further information and updates on status.zoom.us shortly.
Sorry for the inconvenience.
Thank you very much for your patience."