What is your operating system?
Linux Mint 20.1 Cinnamon 64-bit
What is your Shotcut version (see Help > About Shotcut)? Is it 32-bit?
21.05.18 64-bit
Can you repeat the problem? If so, what are the steps?
Yes. I go through and add & adjust the “Size, Position, Rotate” filter to a bunch of my Timeline clips. Then I press Ctrl+Z once and all my filters are gone.
This is not a bug. Undo doesn’t work for filters (doesn’t work for keyframes either).
The last undoable thing you did was maybe something like cutting a video into smaller clips.
When you used undo, Shotcut went back to the point before the last cut, where there was no filters applied.
Oh. Wow, this software is really confusing. Thanks anyway!
It is #1 on the road map though. So we can expect to have undo work for filter at some point in the future.
It is a good idea to check that road map page before reporting a bug by the way 
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