What version of Magisk are you using? i use the latest canary magisk, using edexposed v0.4.5.5 CTS true
see this page https://forum.xda-developers.com/pix...hread-t3992607
Pixel 4XL 1st StockROM(Oct patch) is v0.4.5.5(CTS ture) & GB works fine.
Nov Patch is v0.4.5.5(CTS false), v0.4.6.0(CTS ture) & GB with waiting for framework to respond.