If the destination file already exists, and the project setting "silently increment filenames to avoid overwriting" is not enabled, -renderproject will quit without rewriting the file.
There may be a bug that causes -renderproject to generate a rendered file with no filename, just the extension, like ".wav". Does a file like that exist in the target directory?
If so, you can work around this for now by opening the render dialog and specifying a filename. If no filename is specified, the render dialog will fill in the project name as a default, but the bug is that -renderproject does not.
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