Recover from Syntax Error: Error: Missing helper:

Whenever a Handlebars exception occurs, e.g.
`{{ foo.bar }` *Note: the missing `}`*
And then a fix is applied, e.g.
`{{ foo.bar }}`

All custom helpers are gone (deleted and not reloaded), resulting in:
`Error: Missing helper:`
on page refresh.

**Edit:** I guess it happens on every change that triggers `watch` whether or not there is a syntax error.
**Edit 2:** It appears to be random. It randomly has the custom helper, and randomly does not. Race condition of sorts?