[experiments] Experiment was shared, together with toolchain, but configurator refuses to use it

For example, this experiment was shared with the team system/administrators:

https://www.beat-eu.org/platform/experiments/setup/chichan/chichan/full_mlbphs/1/MLBPH_comp7/

As you can see, if you try to fill-in the label and then press the Go button, the configurator refuses to submit the experiment saying the toolchain is not public.

The expected behaviour is that it allows us to run the experiment, given the toolchain is also shared with us:

https://www.beat-eu.org/platform/admin/toolchains/toolchain/213/?_changelist_filters=q%3Dchichan