[Magisk] ScottIsMyName:
Here are the results of running the latest magisk binaries on the phone itself (from a shell on the phone, not from Magisk Manager).

If anyone is interested in any of the intermediate files it creates/extracts, let me know:

taimen:/data/local/tmp $ ./boot_patch.sh boot.img
- A/B partition detected, current slot: _a
- Mounting /system, /vendor
- Device skip_initramfs detected
- Unpacking boot image
MagiskBoot v14.4(1440) (by topjohnwu) - Boot Image Modification Tool

Parsing boot image: [boot.img]

KERNEL [16882246] @ 0x00008000
RAMDISK [9120776] @ 0x01000000
SECOND [0] @ 0x00f00000
EXTRA [0] @ 0x00000100
PAGESIZE [4096]
OS_VERSION [8.0.0]
PATCH_LEVEL [2017-09]
NAME []
CMDLINE [console=ttyMSM0,115200,n8 earlycon=msm_serial_dm,0xc1b0000 androidboot.hardware=taimen androidboot.console=ttyMSM0 lpm_levels.sleep_disabled=1 user_debug=31 msm_rtb.filter=0x37 ehci-hcd.park=3 service_locator.enable=1 swiotlb=2048 firmware_class.path=/vendor/firmware loop.max_part=7 buildvariant=user]

DTB [391780]
KERNEL_FMT [lz4]
RAMDISK_FMT [gzip]

- Checking ramdisk status
MagiskBoot v14.4(1440) (by topjohnwu) - Boot Image Modification Tool

Loading cpio: [ramdisk.cpio]

- Stock boot image detected!
- Backing up stock boot image
81920+0 records in
81920+0 records out
41943040 bytes transferred in 0.401 secs (104596109 bytes/sec)
MagiskBoot v14.4(1440) (by topjohnwu) - Boot Image Modification Tool

Compressing to [stock_boot_6d4d920f9d0b6eee52de8a95614a9884ef80d732.img.gz]

- Patching ramdisk
MagiskBoot v14.4(1440) (by topjohnwu) - Boot Image Modification Tool

Loading cpio: [ramdisk.cpio]

Add entry [init] (0750)

Dump cpio: [ramdisk.cpio]

MagiskBoot v14.4(1440) (by topjohnwu) - Boot Image Modification Tool

Loading cpio: [ramdisk.cpio]

Create directory [overlay] (0000)

Dump cpio: [ramdisk.cpio]

MagiskBoot v14.4(1440) (by topjohnwu) - Boot Image Modification Tool

Loading cpio: [ramdisk.cpio]

Add entry [overlay/init.magisk.rc] (0750)

Dump cpio: [ramdisk.cpio]

MagiskBoot v14.4(1440) (by topjohnwu) - Boot Image Modification Tool

Loading cpio: [ramdisk.cpio]

Create directory [overlay/sbin] (0750)

Dump cpio: [ramdisk.cpio]

MagiskBoot v14.4(1440) (by topjohnwu) - Boot Image Modification Tool

Loading cpio: [ramdisk.cpio]

Add entry [overlay/sbin/magisk] (0755)

Dump cpio: [ramdisk.cpio]

MagiskBoot v14.4(1440) (by topjohnwu) - Boot Image Modification Tool

Loading cpio: [ramdisk.cpio]

Loading cpio: [ramdisk.cpio.orig]

Backup mismatch entry: [init] -> [.backup/init]
Record new entry: [overlay] -> [.backup/.rmlist]
Record new entry: [overlay/init.magisk.rc] -> [.backup/.rmlist]
Record new entry: [overlay/sbin] -> [.backup/.rmlist]
Record new entry: [overlay/sbin/magisk] -> [.backup/.rmlist]

Dump cpio: [ramdisk.cpio]

MagiskBoot v14.4(1440) (by topjohnwu) - Boot Image Modification Tool

Loading dtbs from [dtb]

MagiskBoot v14.4(1440) (by topjohnwu) - Boot Image Modification Tool

MagiskBoot v14.4(1440) (by topjohnwu) - Boot Image Modification Tool

Pattern 736B69705F696E697472616D6673 found!
Patching to 77616E745F696E697472616D6673
- Repacking boot image
MagiskBoot v14.4(1440) (by topjohnwu) - Boot Image Modification Tool

Parsing boot image: [boot.img]

KERNEL [16882246] @ 0x00008000
RAMDISK [9120776] @ 0x01000000
SECOND [0] @ 0x00f00000
EXTRA [0] @ 0x00000100
PAGESIZE [4096]
OS_VERSION [8.0.0]
PATCH_LEVEL [2017-09]
NAME []
CMDLINE [console=ttyMSM0,115200,n8 earlycon=msm_serial_dm,0xc1b0000 androidboot.hardware=taimen androidboot.console=ttyMSM0 lpm_levels.sleep_disabled=1 user_debug=31 msm_rtb.filter=0x37 ehci-hcd.park=3 service_locator.enable=1 swiotlb=2048 firmware_class.path=/vendor/firmware loop.max_part=7 buildvariant=user]

DTB [391780]
KERNEL_FMT [lz4]
RAMDISK_FMT [gzip]

Repack to boot image: [new-boot.img]

KERNEL [16882246] @ 0x00008000
RAMDISK [9472408] @ 0x01000000
SECOND [0] @ 0x00f00000
EXTRA [0] @ 0x00000100
PAGESIZE [4096]
OS_VERSION [8.0.0]
PATCH_LEVEL [2017-09]
NAME []
CMDLINE [console=ttyMSM0,115200,n8 earlycon=msm_serial_dm,0xc1b0000 androidboot.hardware=taimen androidboot.console=ttyMSM0 lpm_levels.sleep_disabled=1 user_debug=31 msm_rtb.filter=0x37 ehci-hcd.park=3 service_locator.enable=1 swiotlb=2048 firmware_class.path=/vendor/firmware loop.max_part=7 buildvariant=user]