Why are back-to-back \autocite commands not working in ConTeXt-SBL?

[Joel via ntg-context <ntg-context@ntg.nl>]

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I am using the ConTeXt-SBL module to handle the citations in my article. Using the plain \cite[na2006] command has worked fine.
But there are some situations where I want the footnote to include page number details. I tried using \cite[extra=2][na2006], but that doesn't seem compatible with ConTeXt-SBL. I checked the documentation, and if I understand correctly, I should use the autocite command to add page numbers to my citation? Like this:

    \autocite[{\loc[2]}][]{na2006}
This solution works in 95% of cases, but when I need to cite another book immediately after that, it throws up errors:

This won't compile:       \autocite[{\loc[2]}][]{na2006}    \autocite[{\loc[2]}][]{clark1989}    This won't compile:       \autocite[{\loc[2]}][]{na2006}%%
    \autocite[{\loc[2]}][]{clark1989}
This also won't compile:
    \autocite[{\loc[2]}][]{na2006}\autocite[{\loc[2]}][]{clark1989}
After much trial and error, I found this will compile:
       \autocite[{\loc[2]}][]{na2006}
    \autocite[{\loc[2]}][]{clark1989}
The problem with this last example, is if my citations appear within the paragraph, then I end up with a paragraph break in the wrong place!

Here is my minimum working example, which won't compile unless I add a blank line between the two citations.

 \usemodule[publ-imp-sbl]
\startbuffer [bib]

@Article{na2006,
title={Volcanoes \word{of} New Mexico},
year={2006},
journal={New Mexico Earth Matters},
publisher={New Mexico Bureau \word{of} Geology \word{and} Mineral Resources},
volume={6},
number={1},
location={Socorro, New Mexico}
}

@Book{clark1989,
author = {Clark, William},
title = {Railroads \word{and} railroad towns \word{in} New Mexico},
publisher = {New Mexico Magazine},
year = {1989},
address = {Albuquerque, New Mexico},
isbn = {9780937206126}
}

\stopbuffer

\usebtxdataset[bib.buffer]

\setupbtx[dataset=default]
\usebtxdefinitions[sbl]
\setupbtx[sbl]

\starttext

    \autocite[{\loc[2]}][]{na2006}
    \autocite[{\loc[3]}][]{clark1989}

    
    \startchapter[title=Bibliography]
        \placelistofpublications
    \stopchapter

\stoptext
Is the autocite command the wrong tool for what I need? How can I place citations right next to each other, but also include page number information with ConTeXt-SBL?
--Joel


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