Hello again Uxyll,
just as a follow-up, the rest of the software team and I want to thank you for your feedback and contribution to solving the issues with Raspberry Pi 4 Model B boards. We now have a fix available to download from here: Shake OS v0.20 image update for recent 4B model builds
You helped greatly in identifying the source of the problem, and this sped-up a lot of work for our team, so thank you again!