Versions
CraftBook version 3.10.4-SNAPSHOT;4695-9ae40fa
git-Paper-547 (MC: 1.16.5)

Describe the bug
The Sign Copier doesn't work under the Paper Adventure System. Colour codes are not translated into colours, but are displayed in plain text on the sign.

To Reproduce

1. Copy a sign using an ink sac.
2. /sign edit 2 "&5&ltest"
3. Paste the edited text on the sign using an ink sac.

Expected behavior
The colour codes given shall be translated into the respective colour or formatting.

Screenshots

If Paper's adventure system has caused this, it's a Paper bug

So it's not, like all the chat components stuff, a necessary adjustment to the new Adventure API system, but a bug. That's very good to know! Which method exactly is no longer working as it should? I can't open a paper bug report that says: The Craftbook Sign Copier doesn't work anymore, you must have destroyed the feature somehow with your new adventure stuff xD

Cannot confirm this to be working on a 1.16.4 build, which was pre-Adventure.

I cannot confirm that. I just downgraded my test server to Paper 1.16.5 build 472 (a build before the Adventure System). And the sign copy function works for me. But very cool that you noticed the ticket!

cannot confirm on build 472 of Paper 1.16.5.

I don't know what I'm doing different than you testing this. I reduced my plugins to a minimum and started using WorldEdit version 7.3.0-SNAPSHOT+5716-9a5ef70. The sign copier works on my testserver running Paper 1.16.5 build 472 and stops working with Paper 1.16.5 build 473. Using build 473 it doesn't even paste anything, but this is fixed in later Paper builds. Fact is it doesn't work for any of us in the latest paper version, whether this is due to Paper or not xD

Uhm maybe I misused the feature in the last years. Please, can I or can I not edit colors on a sign using craftbooks sign copier?

You can edit them using the section signs, not ampersands. There was a strong backlash to formatting ampersands because it limited what could be written.

In the future with CraftBook 5, it'll also be possible to use MiniMessage for formatting.

This is intentional behaviour. A vast majority of users did not want colour conversions outside of the Minecraft section code translations.

Nothing is broken here.