The fix for this bug:
Is in this changeset:
With the following comment:
A better fix would be updating the REPL windows so they have a different form of a snapshot cookie which contains all of the snapshots, and then translate to the proper one. But that fix is a little too dangerous right now. So this reverts us to the behavior
we had before we were translating but only in the REPL case.
Filing so we don't forget we want to improve the code.