File > Output > Export to File does not remember which preset you normally use in MC 2020.12.
1) Use a saved preset to make an export
2) Go to do it again - the setting you've just used is not selected, and a different one is selected.
This inability to remember which preset you've selected even happens without actually doing an export:
1) File > Output > Export to File, choose a preset
2) Cancel
3) Start again - a different preset than the one you chose previous is now selected. I can keep doing this cycle and get random other presets every time.
Another problem is the act of creating a preset:
1) Enter the preset settings menu and create an output setting
2) Save the setting and exit that menu
3) The preset you have just saved is not the currently selected one
4) Choose the preset you've just saved from the list
5) The settings are now the preset you started with, not the one you thought you'd saved
The entire process is confusing and none of the presets seem to stay the way they are saved. It's a mess. Sometimes it works (I've created many presets, but they can come 'unstuck' and acquire the attributes of other presets.
Another issue with this panel, when you want to create an h264 export setting.
1) Choose mp4. Create a few settings.
2) A message along the lines of "Quicktime is no longer supported choose a different codec" appears.
It seems that mp4 exports can only be successfully set up by choosing .mov, not .mp4? (This one is hard to pin down as it appears so randomly).
Most of the above is 100% reproducible, some is more random.
Finally, a suggestion - from within that preset menu, it should be possible to delete a preset, since the creation of presets is often a back-and-forth process you want to test and tweak a few times before you get the file size or whatever you want to achieve.