Mistranslation of recursively forwarded effects in JS backend

When running the following program in the JavaScript backend, it runs forever producing `<` on the console, until it stack-overflows:
```
effect stacktrace(): Unit

def withStacktrace{ body: => Unit / stacktrace }: Unit / { stacktrace } = {
def st() = do stacktrace()
try body()
with stacktrace { () => println("<"); st(); resume(()) }
}
def allowStacktrace{ body: => Unit / stacktrace }: Unit = {
try body()
with stacktrace { () => resume(()) }
}

def foo(n: Int): Unit / stacktrace = withStacktrace {
if (n > 0) {
foo( n - 1 )
} else { do stacktrace() }
}

def main() = allowStacktrace {
foo(2)
}
```
(no playground link, since the playground just hangs...)

This is not the case in LLVM, Chez (also CPS), and also should not be the case.