It makes sense now, with your explanation, thank you.

Intuit: trying to determine minimum start position...

But isn't this "start position" already determined by \G? :)

In my case it would be easy. Indirect objects can't happen in content streams, so modified (without first check) parseAny_in_stream can be added. It then is called as class method in CAM::PDF::Content. On the other hand, the 150 Mb "R"-less streams are probably too rare to justify any trouble making this fix.