Thank you for reaching out to Community!
Just to make sure we are on the same page, I would like to know if it's the progress bar on a next-project or the progress bar for each sub-task on a classic project?
I tested here on my local site that for next-gen it shows a progress bar for Done sub-tasks and on classic projects, it shows the percentage for each sub-tasks that is related to time tracking.
Please, let me know more details about where the progress bar is not showing and we can test here to check if it's a bug or something recently added.
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