On version 4.1.1.19 Build MAIN-19.59. Running a format on a Block Comment removes line breaks even if you've set the preserve existing option.

Before Format
/*******************************************************************************
Procedure: get_session_variable
Purpose: Retrieves the current value for the provided key.
Notes:
History: 10/20/2015 Code Monkey Initial Creation
*******************************************************************************/
After Format
/*******************************************************************************
Procedure: get_session_variable
Purpose: Retrieves the current value for the provided key.
Notes:
History: 10/20/2015 Code Monkey Initial Creation
*******************************************************************************/