Quick answer: Godot 4 export to a path with spaces failing template substitution? Some template scripts don't quote paths - use spaceless directory or escape.
Export to 'Game Builds/' fails with template error. Same setup with 'GameBuilds/' works.
Use spaceless paths
Always export to no-space paths. Avoids the class entirely.
Or update template scripts
If you maintain templates, quote paths in scripts. Fix at source.
Document the limitation
Project README: don't use spaces in build paths. New contributors learn.
“Build scripts often assume paths without spaces. Don't fight; conform.”
Adopt 'no spaces in build paths' as a convention. The fix is upstream; the workaround is downstream.