Only one subproblem possible

Apparently, only one subproblem can be processed correctly.
When adding a new subproblem, we can't edit it graphically, and, in the student point of view, the first subproblem's workspace overrides the other subproblems:


Start by reproducing the issue with a Blockly problem containing multiple subproblems, checking both graphical editing and the student view. Trace how subproblem workspaces are created and selected; done means each subproblem can be edited independently and the student view uses the corresponding workspace rather than the first one.

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