Hello,
Thanks for contacting us and sorry for any inconvenience that might have been caused due to that.
The URL is redirecting to its trailing slash version:

All the URLs in your sitemap has a trailing slash and the correct version of the URL that you have shared is already indexed in Google:

If you are submitting the URL manually in the GSC then there is no need to submit the URL.
Hope this helps. Let us know if you need any other assistance.
I’m sorry, I did not understand if I’m doing something wrong or do I need to do something to fix this issue?
Is it a good practice that it’s redirected to its trailing slash version?
Thanks
Hello,
Yes, it is normal that the URL is redirecting to the trailing slash version. You can simply ignore the error in the console. The correct URLs are being submitted by your sitemap in GSC so you don’t need to submit them manually.
Hope this clarifies your doubts. Let us know if you need any other assistance.
Thanks.
Hello,
We are super happy that we could address your concern. If you have any other questions in the future, know that we are here to help you.
If you don’t mind us asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.
If you have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.