A small dialog box may appear asking if you want to keep the pre-comp's attributes (like effects or masks) applied to the extracted layers.
: A dialogue box allows users to decide whether to keep or delete properties from the pre-comp and whether to delete the now-empty pre-composition from the project panel entirely. Critical Limitations to Note
Use a project dashboard composition. Never precompose without a reason. And when you need to reverse it, let the script do the heavy lifting.
: It is designed to maintain effects, keyframes, and expressions during the transfer, which is notoriously difficult to do manually without breaking links.
You must open the pre-comp, copy the layers, paste them into the main comp, and manually re-align the timing and tracking.