Anchor point position is not precise as if snapped to an unknown grid
So, the issue is with the anchor point placement on the artboard. At one stage the bug happens and I am not free to move my anchor points where i want, or I create a new file and it happens from this moment on. It is not linked with any of the preferences, resolution, snap to grid etc.. I tried them all.
So I have to find a previously created file where that doesn't happen, replace the vector content, resize my file and I'm good to go.
When it happens I cannot: snap to point, snap to grid, scale is also affected. It looks like the invisible background grid got scaled up 1000% and is not reversible... the points seams to snap to a grid, that's what I'm seeing :) I can provide 2x data accordingly.
Thanks, have a great day!
A.
iMac retina 27" 2019
3,1 GHz - 8GB DDR4
OS Big Sur 11.1
Illustrator 2020

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A., I wonder if the problem still haunts you. Is it any better?
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This definitely requires sharing the file, sending it to sharewithai@adobe.com, with the video, showing you trying it, changing options, snaps and stuff.