How to debug a plugin with source-maps

I have a question about debugging a plugin with source-maps.

Unfortunately, I do not found a way to debug my plugin in the Joplin dev tools with working source-maps.

May I missed something in configuration.

The DevTools always show errors.

plugin_io.github.makaanneo.Athena.js:2 Athena plugin started!
plugin_io.github.makaanneo.Athena.js:2 register settings
plugin_io.github.makaanneo.Athena.js:2 initilize settings
plugin_io.github.makaanneo.Athena.js:2 assing settings
plugin_io.github.makaanneo.Athena.js:2 Athena plugin start watching!
2plugin_io.github.makaanneo.Athena.js:2 initilize settings
plugin_io.github.makaanneo.Athena.js:2 start watch of D:\test\in
plugin_io.github.makaanneo.Athena.js:2 watchAndImport File D:\test\in\angebot - Kopie (2).pdf has been added
plugin_io.github.makaanneo.Athena.js:2 START: import file: D:\test\in\angebot - Kopie (2).pdf from folder D:\test\in.
plugin_io.github.makaanneo.Athena.js:2 Start Load file
plugin_io.github.makaanneo.Athena.js:2 Handler pdfTypeHandler can Handle: true file extension .pdf
plugin_io.github.makaanneo.Athena.js:2 Warning: Setting up fake worker.
plugin_io.github.makaanneo.Athena.js:2 watchAndImport File D:\test\in\angebot - Kopie.pdf has been added
plugin_io.github.makaanneo.Athena.js:2 START: import file: D:\test\in\angebot - Kopie.pdf from folder D:\test\in.
plugin_io.github.makaanneo.Athena.js:2 Start Load file
plugin_io.github.makaanneo.Athena.js:2 Handler pdfTypeHandler can Handle: true file extension .pdf
plugin_io.github.makaanneo.Athena.js:2 watchAndImport File D:\test\in\angebot.pdf has been added
plugin_io.github.makaanneo.Athena.js:2 START: import file: D:\test\in\angebot.pdf from folder D:\test\in.
plugin_io.github.makaanneo.Athena.js:2 Start Load file
plugin_io.github.makaanneo.Athena.js:2 Handler pdfTypeHandler can Handle: true file extension .pdf
3plugin_io.github.makaanneo.Athena.js:2 Find note by hash.
DevTools failed to load source map: Could not parse content for file:///C:/Users/makaa/.config/joplindev-desktop/tmp/index.js.map: Unexpected end of JSON input
3plugin_io.github.makaanneo.Athena.js:2 Skip duplicated file.

The source map is not in the directory.

I appreciate any help.