In the installation documentation, instead of downloading the dtbo.img and vendor_boot.img images from LineageOS, it will be more consistent to extract these item from the full image. In some case the version of these files corresponding to the /e/-os one may not be available.
The procedure is described in : OnePlus - 9 Pro - lemonadep - Documentation Suggestions - #7 by bofh666
1. download [latest release of payload-dumper-go ](https://github.com/ssut/payload-dumper-go/releases) to the same directory (*) where /e/OS build ZIP file is
2. open terminal an `cd` to (*) directory
3. extract payload: `unzip e-*-s-*-dev-dubai.zip payload.bin`
4. extract payload-dumper-go: `tar xzvf payload-dumper-go_1.2.2_linux_amd64.tar.gz payload-dumper-go`
5. run `./payload-dumper-go -partitions dtbo,vendor_boot -o . payload.bin` command — needed files will appear in (*) directory.