The weighted ejector will eject moving contraptions, it does it on gantrys, I didn't test other things, but I suspect they will also get ejected.
I think it does make sense if it ejects minecart contraptions, but otherthings just doesn't make sense at all, and it's very annoying when building compact automations.

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This issue has been closed since it has been inactive for 3 weeks since it was marked as stale.