Changesets are pushed with multiple quests data, while the changeset message and StreetComplete:quest_type don't match its contents as they only describe one quest.
Here is an example.
EDIT : Before closing the changeset the data unrelated to the quest is removed. Shouldn't this cleanup be done locally before any upload ?
Versions affected
At least 26.1
What exactly is wrong with that changeset?
No, that's a bug of osmcha.
related: #2253
Sorry, didn't look hard enough for similar issues. Thank you for the triage @westnordost !