Seeing the same issue, basically when you run yarn ios, runs in debug configuration, and works fine, when run in release configuration, we see this error,
2020-04-10 18:05:17.460983+0300 collect[8448:2356523] *** Terminating app due to uncaught exception ‘NSInvalidArgumentException’, reason: '* -[NSFileManager copyItemAtPath:toPath:options:error:]: source path is nil’**
Then looked into the paths and saw this,
Somehow the font files are not being copied anymore after updating to latest expo-cli + expo 37
Any advice here?