Thanks Tobias, it’s due to this change in Discourse:
https://github.com/discourse/discourse/commit/2b2434b82d2c7919e764248f756246d5f1d686b2
I’ve addressed the issue in Layouts:
https://github.com/paviliondev/discourse-layouts/commit/5d8360c056e6c7915e96809b03ffc930d5ef9860