Why does user access to a Power BI report get revoked when I make changes and republish the report, requiring me to grant access again?

Question

I'm encountering a challenge in my project where, upon making modifications to a Power BI report and republishing it, individuals who previously had access to the report are unable to view it until I manually restore their access. What could be causing this behavior, and how can I address it to ensure consistent user access after report updates? What could be the possible reason behind it and how to fix it?