False positive PDF-HUL-110 "Invalid object number or object stream" when Dictionary contains /Extend ?

[asciim0]

Unfortunately I cannot share the problematic file, but JHOVE throws an error
PDF-HUL-110 "Invalid object number or object stream"
on a stream object whose dictionary looks standard conformant. All stream-objects within the PDF can be uncompressed via qpdf --stream-data=uncompress, I therefore do not suspect an error within the object stream itself.

Looking at the object that the offset is reported for, it contains an /Extend entry:

<</Extends 34 0 R/Filter/FlateDecode/First 281/Length 1948/N 32/Type/ObjStm>>stream

That's not a problem and obj 34 is a stream object itself that looks valid.
I have the suspicion that the /Extend entry causes a false positive for this error.

[asciim0]

I'm still encountering this, however, with other PDF-hul error messages. Most recently a PDF-hul 2 "Invalid destination object", but the dictionary looked the same:
<< /Extends 18843 0 R /Filter /FlateDecode /First 354 /Length 1534 /N 33 /Type /ObjStm >>

@carlwilson - is it true that this can appear for different PDF-hul errors? I guess the original PDF-hul 110 might have gotten shifted to PDF-hul 2 somewhere between April 2021 and today.