SC2317 false positives on scripts run with source and having return as its last command

[pteroismw]

For bugs

• Rule Id (if any, e.g. SC1000):
• My shellcheck version (shellcheck --version or "online"):
• The rule's wiki page does not already cover this (e.g. https://shellcheck.net/wiki/SC2086)
• I tried on https://www.shellcheck.net/ and verified that this is still a problem on the latest commit

For new checks and feature suggestions

• https://www.shellcheck.net/ (i.e. the latest commit) currently gives no useful warnings about this
• I searched through https://github.com/koalaman/shellcheck/issues and didn't find anything related

Here's a snippet or screenshot that shows the problem:

main.sh

#!/bin/bash
# shellcheck source=./sourced.sh
source sourced.sh
echo "this comes after 'source sourced.sh'"
echo "the next line"

sourced.sh

return

Here's what shellcheck currently says:

> shellcheck -x main.sh

In main.sh line 4:
echo "this comes after 'source sourced.sh'"
^-- SC2317 (info): Command appears to be unreachable. Check usage (or ignore if invoked indirectly).

In main.sh line 5:
echo "the next line"
^------------------^ SC2317 (info): Command appears to be unreachable. Check usage (or ignore if invoked indirectly).

For more information:
  https://www.shellcheck.net/wiki/SC2317 -- Command appears to be unreachable...

All lines following source ... are reported as unreachable.

Here's what I wanted or expected to see:

The highlighted commands are reachable and should not be flagged.