When I create a color token with the same value like a previously created token, the existing token gets deleted. This makes creating design system visual themes in Adobe XD a real mess.
We are sorry to hear you're having trouble. I am unable to replicate the issue at my end on my windows machine and on the latest XD version (XD 55).
Could you please share a short video showing the issue and also the version of XD and the details of your operating system?
We will try our best to help.