Bug description

I'm getting a Unison Runtime error when running the following program

To reproduce :

In UCM

clone @baccata/smithy/@baccata/bug-report
run example.main

Edit : more minimal reproduction

Here's a minimal program that showcases the problem. It seems to arise with the Each ability.

repro = do
  update n = do Store.modify (m -> m Nat.+ n)
  list =  (List.range 0 10) |> List.map update
  withInitialValue 0 do
    Each.run do (each list)()

Environment

• ucm --version : release/0.5.49'
• OS/Architecture: Apple M1 Max, MacOS 15.4.1

Additional context
Add any other context about the problem here.