user38899: I'm trying to use the blending mode. When I start the project, there is no problem with the blending mode. But after a few days, the blending mode of some of my precomps always changes to "-". After that the effects are deleted and I can't change the state.
Does anyone know how to solve this problem?


user4426: I think this can happen when you switch on Collapse Transformations (the sun icon  ) on your pre-comp.  This changes the order in which After Effects renders things - there's a good example of this here:
https://pixelsandpaths.com/posts/tutorials/using-collapse-transformations-and-continuously-rasterize-in-after-effects-by-school-of-motion/

38899: <p>I'm trying to use the blending mode. When I start the project, there is no problem with the blending mode. But after a few days, the blending mode of some of my precomps always changes to &quot;-&quot;. After that the effects are deleted and I can't change the state.</p>
<p>Does anyone know how to solve this problem?</p>
<p><a href="https://i.stack.imgur.com/unIor.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/unIor.png" alt="here is an example of how it looks like..." /></a></p>
 4426: <p>I think this can happen when you switch on Collapse Transformations (the sun icon <a href="https://i.stack.imgur.com/tS3Yy.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/tS3Yy.png" alt="enter image description here" /></a> ) on your pre-comp.  This changes the order in which After Effects renders things - there's a good example of this here:</p>
<p><a href="https://pixelsandpaths.com/posts/tutorials/using-collapse-transformations-and-continuously-rasterize-in-after-effects-by-school-of-motion/" rel="nofollow noreferrer">https://pixelsandpaths.com/posts/tutorials/using-collapse-transformations-and-continuously-rasterize-in-after-effects-by-school-of-motion/</a></p>
