Why don't just trim a layer that contains your pre-comp?
Alt/Opt+[ for the beginning, Alt/Opt+] for the end...
I trim up precomps the way you did all the time.
Before I invoke the Trim Comp To Work Area command, I make sure the main comp's timeline cursor is at the in-point of the comp to be trimmed. After I pull the trigger and trim, I highlight the nested comp layer and simply hit the [ (left bracket) key. The nested comp jumps to the cursor's location, starting at its in-point.
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In case you are looking for a script that can simultaneously convert every selected layer in multiple layered composition to a pre-comp and properly trim them keeping arrangement, this is the right place to go.
Thanks for all the replies, guys!
I happened to find another solution while digging around Google.
I found this *amazing* Un-Precompose plug-in to bring my pre-comp layer back into the comp.
Then I applied rd:_pre-compose to trim it down. (or as I like to call it, "time crop")
I'll give Copilot's Trim Compose script a try next time I need to do this.