I am seeing it on Chrome 87.0.4280.88, 86.0.4240.183, and 79.3945.130. Each of those versions are on a different PC. It does work correctly for me in Firefox. @RobertScheitlin__GISP are you using the arrow, circle, triangle, or ellipse options? Because the point, line, polygon, etc options don't seem to have this issue.
I am using Version 87.0.4280.88 (Official Build) (64-bit) of Chrome and using circle and arrow drawing tools and there is no extra graphic. I remember some people having an issue and it was hardware related, Best to call tech support on this.
I tested on another machine today where it worked correctly in Chrome. So it does appear to be hardware related but I can't control what hardware my users have. I have submitted a ticket to tech support.
I may have a workaround. It seems that the unwanted graphics are being added to the map's GraphicsLayer. In my application I am adding the graphics created by the draw tool to a custom graphics layer so I can do a map.graphics.clear() call and remove the graphics from the map's layer every time I create a new graphic. This removes the unwanted graphics but still allows the final graphic to show on the map since it's in my custom layer. Now I just have to make sure nothing else in my map is added to the map.graphics layer because that will get wiped out using this solution.
We are experiencing the same issue in versions 3.35 and 3.37 too using the same ESRI sample.
Most of the machines are not able to reproduce (working as expected).
The machine on which it reproduces is using the latest Chrome(92.0.4515.107).
Reproducible on EDGE too on the same machine.
Note: When changed the API version to 3.30, it works as expected.
I've created a support ticket with Esri as well to see if the issue for the user can be resolved. Will update if any fixes are found, but seeing as I can't replicate the issue and that Esri might not be able to either - not sure what the fix may be.