Multiline ENV vars not working when using Dotenv with Foreman

[pezholio]

I've recently encountered a problem when using Foreman in conjunction with Dotenv on a Rails project. I've got a ENV file with a multiline string like so:

MULTILINE_ENV_VAR="
Here is
a multiline
env var
"

When I spin up the application as normal (i.e. bundle exec rails s) the env var works as expected, however, if I add the command to a Procfile like so:

web: bundle exec rails s

And run foreman start, the ENV var gets munged. I've created an example Rails project here to demonstrate the error. Here's some screenshots too:

With rails s

With foreman start

I'm not sure if this is a bug with Dotenv or Foreman, but thought it best to try here first.