zoom client for Linux: screen sharing broken under X with zoom client 6.2.3

zoom screen sharing has worked for me under Linux for some time, both under the native client and using the web browser.  I recently upgraded the native client, and screen share stopped working in the native client.  The button is present, but when I use it and designate an application or a screen, I get a black rectangle over the window or screen.  The black rectangle appears in the screenshare and also over the application or screen.  If i drag the application window, while I'm dragging it, I can see the contents and the black rectangle stays in the old location, but as soon as I release it, a black rectangle covers the window again.

More detail: the version is zoom 6.2.3.  Note that this is the "zoomgov" release, latest zoomgov version as of this writing, amd64, for Ubuntu 18.04+.  This is under kubuntu Linux 22.04.

edit: looks like this is a dupe of https://community.zoom.com/t5/Zoom-Meetings/Sharing-windows-or-desktops-on-Ubuntu-22-04-blocks-access-to/td-p/210569 but I don't have permissions to close this.

Workaround: use the web browser version.