Wiping dalvik won't do anything on Android 10+. You can submit a logcat, but it won't show anything, because the wakelock is held by one of your applications. If you reboot the phone, unlock it and then put it to sleep, you'll have deep sleep. Once you open one or more of the suspect apps, even if you exit it by pressing 'back' button, the app would still remain in the background. Good apps release wakelocks before exiting.
Keep in mind, although, my device is Oneplus 8, I still keep my Oneplus 6 for development. I regularly flash updates and there is no deep sleep issues at all on the last 1-2 releases.