[atlas] Measurement with msm probe type isn't working

Dear Atlas team.
I have a script to launch a new measurement using an old measurement
list of probes ids, using type:msm. This script worked ok several
times (last time like 1 month ago), but now it gives me the error:

{"error":{"detail":"There was a problem with your request","status":400,"title":"Bad
Request","code":102,"errors":[{"source":{"pointer":"/probes/0/value"},"detail":"The
measurement you selected for your probe request does not exist"}]}}

However I still can see the old measurement on the web page!

I solved it downloading the list of probes using a GET to
  https://atlas.ripe.net/api/v2/measurements//<OLD_MEASUREMENT_ID>?fields=probes'
and then giving the complete probes list to my script.

Is there any recent change with the type:msm call?

Thanks,

Hugo

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