reproducable build fails although there is no diff

See https://f-droid.org/wiki/page/de.schildbach.oeffi/lastbuild:

Build Log

'compared built binary to supplied reference binary but failed'
detail

Unexpected diff output:

This obviously doesn't make any sense. If there is no difference between the fdroid build and the developer supplied build, the build is reproducable. So why does it fail?

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