Auto Identifier Cannot be Disabled

[thekief]

We have a small setup with Pandoc and Lua filters to generate some documentation. While running the filter, which includes files similar to pp, we get the output

[WARNING] Duplicate identifier ...

The call looks like this:

/usr/local/bin/pandoc                           \
  -f markdown+lists_without_preceding_blankline-auto_identifiers \
  -t markdown+lists_without_preceding_blankline-auto_identifiers \
  -L ./lua-filters/include-sections.lua         \
  -o _tmp.md orig.md

I'm a bit confused why the auto identifiers extension seems to be run, although it's disabled. Is that maybe some weird interaction with the Lua filter?