For no particularly good historical reasons, there are a number of places where an exception is rethrown by creating a new Exception, eg:

{{ catch(\Exception $e) { throw new \Exception($e->getMessage()); } }}

This loses the stack trace, and is more complicated than just rethrowing the exception:

{{ catch(\Exception $e} { throw $e; } }}

Review and clean these up.

(There are some cases where an exception is intentionally recast to a different type of exception, those should probably remain as is.)