Reading in scrollback while konsole writes new output

It used to be the case that when I ran something in konsole that wrote to the console, I could scroll back and read through the history at my leasure while output was appended to the history buffer. What I would see in konsole was stable and would only scroll when I used the scrollbar, shift-pageUp/Down etc.

Obviously this would only work as long as the history I was reading was within the history buffer, so eventually it would be deleted from the history and konsole would start scrolling.

After an OS update and now using Konsole version 22.04.1, it no longer does that with a fixed sized history buffer. It only does that with an infinite history buffer.

Is this a bug?