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Images can be cached by browses, so SharePoint search results could show a cached image (and I have observed this), but it appears that the people picker URL has a timestamp so it may not be subject to any browser caching.Here are the caveats for when images are changed form the SharePoint profile page (My Site):
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When a user changes his/her profile image from SharePoint Online, it is immediately available in Outlook and Lync. But this part can get confusing, so let’s continue…
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DirSync (if synchronizing AD thumbnail images).There are also several ways a user’s photo can be changed: People Picker Field (configured to show the profile image).There are several ways that users can view their profile image or somebody else’s profile image: So, the purpose of this post is to shed some light on how this works today. But, it turns out that they are not and that the rules for how these images are synchronized across the various data stores is a little complicated. If these images were stored in a single location, this would not be a problem. In O365 there are a plethora of ways to view and configure user profile images. Background of User Photo Sync Behavior in Microsoft 365