Set HQ video preview thumbnail instead of a video frame when autoplay is DISABLED

Hey gyus ! Im loving your awesome extension for a long time now its freakin amazing ! But a preview image seems not working properly.
Im talking about preview image of a video with autoplay DISABLED function. Most of other extensions and tampermonkey scripts (like HTML5 autostop) showing author assigned HQ preview image, but ImproveTube shows one of first frames of a video itself instead user preview. Actual for v3.106 now, so does with earlier versions.

Im using CentBrowser 4.3.9.248 Official, x86 (Portable) Chromium 86.0.4240.198 on a Windows 10 x64 pro 1903 (18362.356)
My Player settings:

Preview image quality reference:
For the maximum resolution version of the thumbnail use a url similar to this:
http://img.youtube.com/vi//maxresdefault.jpg

• For the high quality version of the thumbnail use a url similar to this:
  http://img.youtube.com/vi//hqdefault.jpg
• There is also a medium quality version of the thumbnail, using a url similar to the HQ:
  http://img.youtube.com/vi//mqdefault.jpg
• For the standard definition version of the thumbnail, use a url similar to this:
  http://img.youtube.com/vi//sddefault.jpg

It looks like this:
Original video preview -

As it should be - (ImproveTube autoplay ENABLED + HTML5 autoplay disable script)
https://greasyfork.org/ru/scripts/30974-autoplay-disabled-for-html5-videos-pause-on-switch-tab

ImproveTube autoplay DISABLED (showing one of the first frames of a video instead a preview thumbnail) -

I`ll be so happy if you fix this, ImproveTube would the best of them all ! =)

Start by reproducing the issue in the YouTube player with ImproveTube autoplay disabled, then trace the extension's autoplay and video-preview handling. Done means the author-assigned high-quality thumbnail is shown instead of an early video frame when autoplay is disabled; no source file or test is named in the report.