Hi! I have a somewhat similar issue.
Users with iOS16 are experiencing crashes when trying to view a PDF file on a UIWebView (CoreGraphics CGPDFPagePurgeResources), right after loading the request. I filed a report on Feedback Assistant (FB11602834).
Tried to migrate to WKWebView but started to receive compiler errors like "WKWebView before iOS 11.0 (NSCoding support was broken in previous versions)" and straight up Xcode error like "executable path is directory Xcode"
lighthouse-beacon-ios-01
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I'm having the same issue. Had a crash feedback from an iPhone with iOS 15 and the only thing I can download is a json file
Forgot to mention this: the url has no file extension
Forgot to mention this: the fmp4 streams I'm trying to play does not have a manifest.
The workaround on Android was to use ProgressiveMediaSource on Exoplayer. That made the player ignore the fact that there is no manifest and play the stream.