When running cron event produces a fatal error, the shutdown function doesn't run

[jakubmikita]

Bug Report

• Yes, I reviewed the contribution guidelines.
• Yes, more specifically, I reviewed the guidelines on how to write clear bug reports.

Describe the current, buggy behavior

While running a regular cron command:

wp cron event run --due-now

once the event produces a fatal error, the shutdown action and custom register_shutdown_function isn't called.

Describe how other contributors can replicate this bug

1. Register an example cron event.
2. Use callback

add_action( 'example', function() {
	undef_function_9j8yf8me();
} );

3. Watch for log file

register_shutdown_function( function() {
	file_put_contents( dirname( __FILE__ ) . '/log.log', print_r( 'Shutdown called correctly', true ) . "\r\n\r\n", FILE_APPEND );
} );

4. Run event - the log is not saved.
5. Comment the call to undefined function in the event callback.
6. Run event - the log is saved.

Describe what you would expect as the correct outcome

The shutdown function, thus shutdown action executing with fatal errors.

[justinmaurerdotdev]

I'll be looking at this today, during Contributor Day.

[justinmaurerdotdev]

Per my PR at #108, I believe this issue is not valid and can be closed as such.

[johnbillion]

@jakubmikita Are you still experiencing this issue? Can you take a look at the tests in #108 and confirm whether they accurately represent the issue you saw?

Thanks!