After updating /e/OS on both my Samsung Galaxy S9 and another Samsung Galaxy S7, I noticed that my previous recovery (TWRP) had been replace with /e/OS recovery, even though “update recovery” is toggled off in the developers options.
This is an issue because:
The installer does NOT respect the settings
For those who root their phones with Magisk, TWRP is needed to reinstall Magisk after each system update