Linux client 7.2.0 / 7.2.1 cannot join webinars — JoinWebinar.qml error, no window opens (7.1.5 works)

Summary On Linux, Zoom Workplace 7.2.0 and 7.2.1 cannot join webinars from a link. The client launches and receives the zoommtg:// URL, but no webinar window ever opens. It stays on the home screen with no error dialog. Downgrading to 7.1.5 fixes it: the same link opens the "Webinar" window right away.

Environment

• Zoom: 7.2.1.5760 and 7.2.0.5705 fail; 7.1.5.4332 works

• OS: Arch Linux, kernel 6.18 LTS

• Desktop: GNOME Shell 50.5, Wayland session (Zoom running via XWayland, xwayland=true, QT_QPA_PLATFORM=xcb)

• GPU: NVIDIA RTX 3090 Ti, driver 615.71.09

Steps to reproduce

1. Install Zoom 7.2.0 or 7.2.1 on Linux.

2. Click a webinar join link (here a Luma event link that redirects to zoommtg://<org>.zoom.us/join?action=join&confno=...&pwd=...&confid=...).

3. Zoom opens and the launcher logs the URL ("Zoom is running, send message to it: zoommtg://...").

Expected: the webinar join window opens. Actual: nothing happens and no webinar window is created. Restarting Zoom and clicking the link again gives the same result.

Log (~/.zoom/logs/zoom_stdout_stderr.log), logged every time the link is opened:

qrc:/qml/JoinWebinar.qml:144:9: Cannot assign to non-existent property "color"ZoomWebviewHost finally lanuch state is true

No other error follows. With 7.1.5 the same link opens a window titled "Webinar" right away.

Workarounds

• Downgrade to 7.1.5.

• Join through the web client: https://<org>.zoom.us/wc/join/<confno>?pwd=<pwd>.

Regular meetings were not tested on 7.2.x. Only webinar links were confirmed broken.