PUT "/lists/#{id}/idBoard" is returning 404 ... but working (hunh?)

I’m trying to automatically move lists to another board using a tool I’ve already created.

It used to work fine (say a month ago - I use this tool at least once a month).

I’m using the ruby-trello client, but under the hood I can see it’s generating a to
PUT /lists/#{id}/idBoard (with {value: board_id})

It’s returning a 404 which is disrupting the progress, but it is actually moving it to the other board.

Any idea what is going on?

This is now fixed. Must have been a temporary issue.