Select and copy text in normal or pass modes

[plum]

Version: 3.6.0-67-g66d9da4
WebKit compile: 2.38.4
WebKit run: 2.38.5
GTK compile: 3.24.36
GTK run: 3.24.36
libsoup compile: 3.2.2
libsoup run: 3.2.2
Extension dir: /usr/lib/vimb

Steps to reproduce

Expected behaviour

In one or more modes, select text with mouse click and sweep, to then command to copy selected text to clipboard.

Actual behaviour

Thanks for a fantastic browser! I use vimb by preference, and with some nice readability scripting when desired, and dark mode, custom searches, etc/

The problem I have is quite serious for my use, probably somehow unique to my setup, which is running on the latest arch. Or, perhaps I am doing something wrong,as regards modes, I doubt that.
In fact, I can't select to copy here in INPUT mode either, in this text editing box; I wanted to shift the above paragraph to the bottom (-:

Attempting select text with mouse, the highlight does not stick long enough to then copy the text with the key shortcut. in fact it merely flickers and does not cover the area passed with the mouse. I cannot do select all wither. So, I cannot copy text to the clipboard.

Any pointers in this case will be very much appreciated.
John