It would be good for you to review the code precheck report in the moodle.org plugins db - Grunt is also showing a possible issues with your JS not being built:
https://moodle.org/plugins/pluginversion.php?id=18786
This issue should probably have been closed a while ago. The report is viewed occasionally, and the grunt issue is fixed. (At the moment still an issue that should be fixed in the next release)
It would be good for you to review the code precheck report in the moodle.org plugins db - Grunt is also showing a possible issues with your JS not being built: https://moodle.org/plugins/pluginversion.php?id=18786