To reproduce, click on a link inside Telegram. For example, send a message with "kde.org" in it, and then click on it. Normally, you would expect this to open in your default web browser, Firefox in my case. I observed this occurring in both Discord and Telegram, so I assume it affects XWayland clients. I tried typing "https://kde.org" into Konsole and opening the link in there, which opened in Firefox as expected. I tried both Xwayland Firefox and Firefox on Wayland. I don't remember this issue occurring before Plasma 5.21.2.
Does it open in the browser, but the browser remains in the background rather than being brought forward as you wwould expect?
(In reply to Nate Graham from comment #1) > Does it open in the browser, but the browser remains in the background > rather than being brought forward as you wwould expect? What was happening is the link just wasn't opening at all, it opening in the background was the previous behaviour. Anyway, I don't get this issue anymore after a relog, so I'll close it.