Are you sure the project was saved after rendering, or after changing the render settings? If you change a render setting, like the channel count for example, and then render, the project is then marked as "dirty" or edited, but the render settings change won't be saved unless you save the project. If you try to close the project without saving, you will get a popup saying that the project has changed and asking if you want to save it.
If you change the render settings and then close the render dialog without either rendering or pressing the save settings button, the settings change will be discarded even if you then save the project.
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