Markdown code block not interpreted as link text in 3.15.0

[theBrash]

Description:

Steps to reproduce:

1. Update to RocketChat Version 3.15.0
2. Send a message with the following content or look for messages, that use this format :
   [```this is a code block that should also be used as a link```](http://www.thisisadomain.tld)

Expected behavior:

In the previous RocketChat versions the code block was a link. The actual link was hidden.
In GitHub it also works:
this is a code block that should also be used as a link

Actual behavior:

The code block isn't interpreted as the link text anymore.

Server Setup Information:

• Version of Rocket.Chat Server: 3.15.0
• Operating System: Debian 10.9
• Deployment Method: docker
• Number of Running Instances: 1
• DB Replicaset Oplog: ?
• NodeJS Version: v12.22.1
• MongoDB Version: 4.0

Client Setup Information

• Desktop App: 3.2.2
• Browser Version: Opera 76.0.4017.177
• Operating System: Pop!_OS 20.04 LTS

Additional context

Relevant logs:

Browser Log:

/api/ecdh_proxy/initEncryptedSession:1 Failed to load resource: the server responded with a status of 404 ()
/node_modules/@rocket.chat/ui-kit/dist/index.js:1 ui-kit version: 0.26.0
/node_modules/@rocket.chat/fuselage-ui-kit/dist/fuselage-ui-kit.production.js:1 fuselage-ui-kit version: 0.26.0
Henning:1 Failed to load resource: the server responded with a status of 404 ()

Server Log:

(node:8) [DEP0131] DeprecationWarning: The legacy HTTP parser is deprecated.
LocalStore: store created at 
LocalStore: store created at 
LocalStore: store created at 
Setting default file store to GridFS
{"line":"120","file":"migrations.js","message":"Migrations: Migrating from version 222 -> 225","time":{"$date":1622817733011},"level":"info"}
{"line":"120","file":"migrations.js","message":"Migrations: Running up() on version 223","time":{"$date":1622817733012},"level":"info"}
{"line":"120","file":"migrations.js","message":"Migrations: Running up() on version 224","time":{"$date":1622817733015},"level":"info"}
{"line":"120","file":"migrations.js","message":"Migrations: Running up() on version 225","time":{"$date":1622817733019},"level":"info"}
{"line":"120","file":"migrations.js","message":"Migrations: Finished migrating.","time":{"$date":1622817733051},"level":"info"}
Not migrating, control is locked. Attempt 1/30. Trying again in 10 seconds.
{"line":"120","file":"migrations.js","message":"Migrations: Not migrating, already at version 225","time":{"$date":1622817743062},"level":"info"}
ufs: temp directory created at "/tmp/ufs"
Loaded the Apps Framework and loaded a total of 0 Apps!
Using GridFS for custom sounds storage
Using GridFS for custom emoji storage
Updating process.env.MAIL_URL
➔ System ➔ startup
➔ +---------------------------------------------------------------+
➔ |                         SERVER RUNNING                        |
➔ +---------------------------------------------------------------+
➔ |                                                               |
➔ |  Rocket.Chat Version: 3.15.0                                  |
➔ |       NodeJS Version: 12.22.1 - x64                           |
➔ |      MongoDB Version: 4.0.24                                  |
➔ |       MongoDB Engine: mmapv1                                  |
➔ |             Platform: linux                                   |
➔ |         Process Port: 3000                                    |
➔ |             Site URL: https://**********/rocketchat/          |
➔ |     ReplicaSet OpLog: Enabled                                 |
➔ |          Commit Hash: 55457025d6                              |
➔ |        Commit Branch: HEAD                                    |
➔ |                                                               |
➔ +---------------------------------------------------------------+
(node:8) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.

[johncrisp]

On open.rocket.chat earlier

[johncrisp]

Please test on open.rocket.chat
Seems to be fixed.

[theBrash]

I responded to your message on open.rocket.chat. For me it still doesn't work. But your message in the quote is working.
Your message from yesterday:

My reply, which doesn't work, but your message in the quote now looks right:

[theBrash]

The issue still persist. To make this problem a little bit more clear, I have another example.
This is a screenshot of our Problem with the sensitive stuff blurred.
The special part of this is the second code block, which serves as a comment to the first code block.

As you can see, in this example some more stuff comes to light. Like the part " target="_blank" rel="noopener noreferrer">.... which seems to be some internal rocketchat stuff. That part is definitely not in the original message.
Starting with the second code block the text is also a link, which points to the desired URL. If I click on that link the site will be opened within the electron app, not in a separate browser!