Composer.json missing from 2.6 branch and tags

[GaryJ]

I'm looking to pull in bbPress via Composer, but ​https://packagist.org/packages/bbpress/bbpress isn't showing any tags, despite the tags existing in GitHub. Composer fails with a "Root composer.json requires bbpress/bbpress ^{2.6, found bbpress/bbpress[dev-trunk, dev-master] but it does not match the constraint.".}

I think I've tracked it down to the composer.json file not present in the ​2.6 branch which the tags are created from (at least not for 2.6.11, and 2.6.12 isn't present in GitHub) despite it being in the ​`trunk` branch. Would it be possible to fix that please? The composer.json file could exist in the branch/tag, even if any generated zip / push to wporg excludes it.