[xep-support] Marginalia and corresponding text get out of sync

Dear all,
I'm working on generating doubled-sided documents with marginalia (e.g.
admon graphics) using the DocBook XSL Stylesheets. In general this works
fine, but the marginalia and the corresponding text sometimes get out of
sync (e.g. at the end of a page). Is there a solution to keep both together?
I tried keep-with-next.within-page and ...-page on the fo:float element with
my XEP processor (Version 4.4 build 20050615)
but nothing worked. Any hints?

The structure of the fo is:

<fo:float float="outside" clear="both" keep-with-next.within-page="always">
        <fo:block-container
                <fo:block>
                        <fo:block
                                <fo:external-graphic
                        </fo:block>
                </fo:block>
        </fo:block-container>
</fo:float>
<fo:block
        ...

Thanks and best wishes
Ludger Thomas

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