We are sorry for the trouble. As described, the application is crashing when opening some PDFs with forms.
Would you mind sharing the PDF form with us so that we can check it at our end for testing. Please upload the file to the Document Cloud https://documentcloud.adobe.com/link/home/, generate the link and share it with us.
Also, please try to turn off the protected mode for testing purposes (Windows Only) and see if that makes any difference. Go to Edit > Preferences > Enhanced Security > Uncheck 'Enhance protected mode at startup' , turn off the protected mode and uncheck the enhanced security > Click OK and reboot the application and check.
If the PDF file is stored on a shared network/drive, please download the file locally to your computer and then try to open it and see if that makes any difference.
As you have the latest version 20.12.20043 installed, please try to repair the installation (Windows Only) and see if that works for you. Go to Help > Repair Installation.