Chromium: update to 87.0.4280.88-2 introduced graphical glitches

Hello, yesterday, with the Stable update [Stable Update] 2020-12-30
I also received the updated Chromium from 87.0.4280.66-1 to 87.0.4280.88-2; and I noticed graphical glitches which never appeared before:

(here partial drawed avatars)

I also see these glitches in other websites, not only here on the forum.
Is not a problem of extensions, because if I start Chromium with the --disable-extensions flag these glitches still occurs.
With other browsers doesn’t occurs.

Does someone else noticed these glitches with Chromium?
Yeah, I know that maybe it should be reported on the Chromium’s bug tracker, but before I want to be sure that is not driver/software related on Manjaro.

My inxi -G:

Device-1: Intel 3rd Gen Core processor Graphics driver: i915 v: kernel 
           Display: x11 server: X.Org 1.20.10 driver: intel unloaded: modesetting resolution: 1366x768~60Hz 
           OpenGL: renderer: Mesa DRI Intel HD Graphics 4000 (IVB GT2) v: 4.2 Mesa 20.3.1

Anyway, if i launch Chromiun in Terminal, I read a bunch of errors about the skia renderer and GL:

[7824:7824:1231/] Skia shader compilation error

[7824:7824:1231/] [.RenderWorker-0xac25673b000.GpuRasterization] GL_INVALID_OPERATION: Program not linked.

It’s an old mobile GPU, maybe it’s being deprecated by Chromium, try with the --disable-gpu switch.

I tried it on Ubuntu and on Windows: such issue doesn’t occurs; however I had the flag --enablefeatures=WebUIDarkMode,CheckerImaging,MarkHttpAs,ScrollAnchorSerialization,brotli-encoding which, seemed to be the culprit. (I wait to confirm)

For the rest, despite the old mobile GPU, on Chromium everything is fast and smooth; and in chrome://gpu

All is ok:
* Canvas: Hardware accelerated
* Compositing: Hardware accelerated
* Multiple Raster Threads: Enabled
* Out-of-process Rasterization: Enabled
* OpenGL: Enabled
* Hardware Protected Video Decode: Hardware accelerated
* Rasterization: Hardware accelerated on all pages
* Skia Renderer: Enabled
* Video Decode: Hardware accelerated
* Vulkan: Disabled
* WebGL: Hardware accelerated
* WebGL2: Hardware accelerated

Well there you have it, always provide the full info (with a clean profile).