Bug#962715: Incompatible API versions: encoded with [1,17,5,4] but attempted to decode with [1,20]

[Eric Marsden <emarsden@risk-engineering.org>]

Package: pandoc-sidenote
Version: 0.20.0-1

When invoking pandoc-sidenote as a pandoc filter, it generates an error 
related to "incompatible API versions".

   % pandoc --filter pandoc-sidenote -o /tmp/foo.html foo.md
   pandoc-sidenote: Error in $: Incompatible API versions: encoded with 
[1,17,5,4] but attempted to decode with [1,20].
   CallStack (from HasCallStack):
    error, called at ./Text/Pandoc/JSON.hs:107:64 in 
pandoc-types-1.20-Ip2ZGM2tgGt4TDYVgvP7zF:Text.Pandoc.JSON
   Error running filter pandoc-sidenote:
   Filter returned error status 1


Architecture is amd64. Pandoc version is 2.5-3+b1. Reverting to the 
previous version 0.19.0.0-2+b4 works fine.