Marketing Cloud - Updates to Content Blocks referenced in an email are not included when sending via Journey Builder and Triggered Sends

When an event triggers an email in Marketing Cloud, it creates a copy of the email (including content blocks called from AMPScript functions such as ContentBlockByID, ContentBlockByKey, and ContentBlockByName). To refresh the email, the triggered send will need to be paused, published, and restarted. This can be completed in one of several ways:

1. Manually pause, republish, and restart the email in Email Studio
2. Create and publish a new version of your journey
3. Republish the email from within the journey 

Note: It may be possible to customize SSJS (Server-Side JavaScript) within a CloudPage to automatically republish the triggered send definitions. The following resources include documentation about retrieving and republishing triggered sends via SSJS: 
Retrieve Triggered Send
Publish Triggered Send

This is a temporary workaround due to the bug.

There is an open Known Issue where if you add an auto-suppression list, it will automatically republish email content (including these content block references).

This can be used as a method for mass republishing emails, but is only a temporary solution due to the functionality described in the above Known Issue.