Hello! Yes, I've already ID'ed the issue with items falling through the taskbar and will be in the next patch. As for the black squares around the back of objects and characters, that is a rare repro issue that I haven't been able to get any information on and have been trying to fix, it seems to be fairly rare and I've heard from another user that it might be a CPU issue, doing my best to look into it and solve!
As for the Blue Robot, Bit, they are apart of the Cindesh Content which you can enable in the settings menu but again, if you do not know Cindesh's normal artwork, I would not recommend turning it on. Trust you aren't missing much and you can force spawn him in with the terminal (If you are Admin) without enabling that