front: editing a train with power restrictions resets its power restrictions

[clarani]

What happened?

When clicking on 'edit' for a train which has power restrictions, the power restrictions are automatically reset.

What did you expect to happen?

The power restrictions should not be reset when clicking on editing

How can we reproduce it (as minimally and precisely as possible)?

1. Open a scenario
2. Add a train with power restrictions (you can use a TGV)
3. See the results
4. Click on edit the train
5. See the warning displayed

On which environments the bug occurs?

Recette (SNCF)

On which browser the bug occurs?

Firefox

OSRD version (top right corner Account button > Informations)

.

[axrolld]

Still present on staging 6580cfe with this schedule:
bug_power_restrictions.json

Pathfinding seems launched twice, or at least i get two warning messages saying the power restrictions have been reset when editing the train.

Also the weird thing is after saving it i can't see the power restrictions in my space speed chart: