Hello @Dmitriy Ivanov ,
Welcome to Microsoft Q&A forum.
Sometimes, this issue is caused by taking too much time to write the feedback.
I would suggest you first try to copy the description and click Help > Send Feedback > Report a Problem, then paste the description and submit the feedback again. Try to sign out and then sign in VS to report the problem if re-submit the feedback doesn’t work.
If this error appears again, please try this .NET entry to submit your feedback about Visual Studio on Developer Community directly. After you submit the feedback, you can edit the tags and change it/them to Visual Studio related tags.
If you still can’t submit the feedback, please share the detailed description of your feedback here, I will help you to report the feedback.
Feel free to contact us, have a great day.
Best Regards,
Tianyu
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