If I open a font right off (like open with context menu) and Font Forge is closed, it will open a window with empty glyphs. Now if I leave this new empty window open and try to open the font again, it will work.
OS: MacOS 11.0.1
FontForge: 20201107
The empty font it opens:

If I open a font right off (like open with context menu) and Font Forge is closed, it will open a window with empty glyphs. Now if I leave this new empty window open and try to open the font again, it will work.
OS: MacOS 11.0.1
FontForge: 20201107
The empty font it opens: