Double-clicking or using right-click->"Open with..." on MATLAB files (.m, .mat, .mlapp) opens a functional MATLAB 2020a window. Using MATLAB via terminal (/Applications/MATLAB_R2020a.app/bin/matlab -nodesktop) works just fine as well.
However, double clicking the MATLAB_R2020a.app icon or trying to open MATLAB via Spotlight results in a non-responsive MATLAB window with the rainbow spinning wheel. The bottom message says "Ready". Is there any way to fix this?