Description:

When sending a message with specific content inside a code block, Rocketchat replaces the content of the code block with something looking like internal state.

Server Setup Information:

• Version of Rocket.Chat Server: 0.59.3
• Operating System: Debian GNU/Linux
• Deployment Method(snap/docker/tar/etc): docker
• Number of Running Instances: 1

Steps to Reproduce:

1. paste a message containing a specific code block

`\(.*\)`

Expected behavior:

Rocketchat displays the given message formatted as code

Actual behavior:

Rocketchat substitutes the content of the code block with internal data, e.g.:

=!=kCFKHzxbbR9nm8KHW=!=

When editing the message, it shows the original message. When resubmitting the edited message, the substitution contains a different string. Via WebSocket, the original message is sent.