Run of unchanged for firefox-developer-edition-kbx

Try this locally package):

debcheckout firefox-developer-edition-kbx
cd firefox-developer-edition-kbx
DEB_UPDATE_CHANGELOG=auto true
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Running 'sbuild -Asv --dpkg-file-suffix=+jan --force-orig-source --source-only-changes'
Building using working tree
Version suggests non-native package, but format is for native.
Building package in native mode
Building the package in /home/janitor/tmp/janitor02p3qqd3/build-area/firefox-developer-edition-kbx-0~2021.09.0, using sbuild -Asv --dpkg-file-suffix=+jan --force-orig-source --source-only-changes
dpkg-source: error: can't build with source format '3.0 (native)': native package version may not have a revision
E: Failed to package source directory /home/janitor/tmp/janitor02p3qqd3/build-area/firefox-developer-edition-kbx-0~2021.09.0
brz: ERROR: The build failed.

Full worker log Full build log