v4.4 schema is not published to github pages

This URL gives a 404: https://the-strategy-unit.github.io/nhp_model/v4.4/params-schema.json

The previous model version schema was published successfully at https://the-strategy-unit.github.io/nhp_model/v4.3/params-schema.json - what's happened to the action between 4.3 and 4.4 ?

Error here: https://github.com/The-Strategy-Unit/nhp_model/actions/runs/21477711358/job/62759874065