I will deeply appreciate any piece of advice leading to solve the following mystery.
I have a SU file (the only one of these kinds of its behaviour in my life - attached-please-find under the link below) that behaves in a very strange manner.
Both in SU 2020 Pro and SU 2021 Pro (windows Pro 10 64 bit, 64 RAM, Nvidia RTX 5000 12 GB).
Whilst I save the file it reacts as well instantly after the save as undo the very last operation. Ex moving an object, changing tag visibility, etc.
The only way to fix it is to perform Cleanup (plugin) or via native SU utilities with checking the errors just before saving the file in question. No errors are found.
Some parts within the file come from Autocad. Perhaps there are some overlaps that I cannot identify.
I do thank you for any elucidation. It has been still workable but very annoying,