Errors while running learnr & grader on a shiny server but not when run as a document

I am trying to run a learnr tutorial with grader on my own shiny server. The "Submit Answer" function works when I run the document in an Rstudio session, but when I run it on the server, I get the error:

Error in get(name, envir = asNamespace(pkg), inherits = FALSE) : object 'check_result' not found

I'm not sure if this is relevant, but the server .log show this:

Warning in selectChildren(jobs, timeout) : cannot wait for child 1367 as it does not exist

Thank you!

The minimal .Rmd that reproduces the error for me is:

Sorry, this isn't formatting properly at all!

title: "grader_shiny_test"
    progressive: true
    allow_skip: true
runtime: shiny_prerendered

```{r setup, include=FALSE}
tutorial_options(exercise.checker = grade_learnr)
knitr::opts_chunk$set(echo = FALSE)
Modify the following code by deleting the second argument.

```{r ex2_2, exercise=TRUE}
round(1234.567, digits=2)
```{r ex2_2-solution}
```{r ex2_2-check}
    result(1235, "good job", correct=TRUE)

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