docbook with saxon 8.7.3

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Hello. Wondering if anyone has been able to successfully use docbook with
saxon 8.

I'm getting the following error:

"Don't know how to chunk with Saxon 8.7.3 from saxonica
processing terminated by xsl:message at line 45 in chunker.xsl"

It appears that maybe I need to add a case statement for saxon 8, but
wouldn't have a clue as to what to add.

I'm using docbook 1.69.1

Thanks!