Which Umbraco version are you using? (Please write the exact version, example: 10.1.0)
10.3.2
Bug summary
The page is published when users click on "Save and preview" for the personalised version only.
Third-party response:
"As described here this is an Umbraco bug as uMarketingSuite simply calls the Umbraco APIs to publish a specific variant and we have verified we do this correctly. However, Umbraco publishes all variants instead."

Specifics
No response
Steps to reproduce
Go to a personalized page.
Hit the Save & Preview button of that personalized content.
View the History on the Info tab.
save_and_preview.webm
Expected result / actual result
Expected Result:
Umbraco will publish both versions instead of simply saving them.
Actual Result:
Umbraco will only save all inputted values, and open a new tab for the preview page.
Note that the “Save and preview” button at the bottom of the page (which is used for the original content) still just save the works as usual.