I've been seeing something similar. my screen is not the blank white though and I think I have since figured out the funk.
my symptom was seen upon entering a website ... I would get a "Q" on my screen literally the size of the screen. I had no idea what it was. I figured the Q-enun dudes were hacking me.
I know think this is a result of the web browser loading the code libraries in a more seqential fashion, i.e. top-down. in looking at the pages code, it certainly loads a bunch of crap from all over the place and here's what you're, as what I saw....
the browser shows you what it has to show you while process the pages many downloads and executions. you're seeing the white blank background screen interim.
I believe my Q is actually the "search" button icon but when the web page code says "fill area" with this icon" and the area is the whoe screen (cause nothing else has loaded), I see a big fat "Q" and you see a big fat white spot.
I noticed this eventually as I was also seeing a monstrously large pharse-book and 2weat symbols.
in short ... you're seeing the results of too much damn code in the web page.
check it out some time, go into your browser options/settings/menu and view the "page source".
you'll be surprised on how much you download and run on your browser ... stuff from all over the web. even on a site like this one.
see my example of external links you run/download when entering this page alone:
DON"T GO TO THESE LINKS !!!!!!!!
<script async src="
"></script>
<script type="text/javascript" src="
"></script>
<script defer src="
7" integrity="sha512-gV/bogrUTVP2N3IzTDKzgP0Js1gg4fbwtYB6ftgLbKQu/V8yH2+lrKCfKHelh4SO3DPzKj4/glTO+tNJGDnb0A==" data-cf-beacon='{"rayId":"6bc7cc611fdf1978","version":"2021.11.0","r":1,"token":"cb78cf4ee4374851ae1860c00306e219","si":100}' crossorigin="anonymous"></script>
<script src="
"></script><script>window.jQuery || document.write('<script src="/xen/js/vendor/jquery/jquery-3.5.1.min.js?_v=6bd01196"><\/script>')</script>
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