Yes, meanwhile I can confirm this personally as well (although on the OnePlus3 on OOS). Really love Magisk so far.
Sorry, why I can't download Kernel version for Stable OOS 3.x.x ROM? On the download page doesn't appear any link: http://kernel.boeffla.de/oneplusx/boeffla-kernel-oos/oos3xx_download/Stable/
"pure nexus"... all said.
Don't expect anyone to analyze your logs. You really should read the support instructions to learn why you are not in support.
Make sure your GPU min frequency is 200 and not lower. That is all I can tell you also without support.
Sorry and have a nice weekend anyways
Oh too bad this is eol and OOS only.
The answer to ur question was 2 posts above ur own.....
No more details development will be made to this kernel.