Pixel 3 XL with Android Q Beta 5 cannot mount partitions

[lssong99]

• I am running an official build of TWRP, downloaded from https://twrp.me/Devices/
• I am running the latest version of TWRP
• I have read the FAQ (https://twrp.me/FAQ/)
• I have searched for my issue and it does not already exist

Device codename: Pixel 3 XL
TWRP version: twrp-3.3.1-1-crosshatch.img

WHAT STEPS WILL REPRODUCE THE PROBLEM?

1. Boot phone into bootloader
2. fastboot boot twrp-3.3.1-1-crosshatch.img
3. after boot into TWRP, select 'Mount'

WHAT IS THE EXPECTED RESULT?

Partitions like System, Data, Storage should be mountable by ticking the checkmark.

WHAT HAPPENS INSTEAD?

1. Only metadata partition are pre-checked
2. All other partitions (System, Data, Storage...) are not checkable. (Even if you try to check it, a check mark will not appear and the partition will not be mounted)

ADDITIONAL INFORMATION

adb mount shows:
crosshatch:/ # mount
rootfs on / type rootfs (rw,seclabel,size=1690556k,nr_inodes=422639)
tmpfs on /dev type tmpfs (rw,seclabel,nosuid,relatime,size=1803612k,nr_inodes=450903,mode=755)
devpts on /dev/pts type devpts (rw,seclabel,relatime,mode=600,ptmxmode=000)
proc on /proc type proc (rw,relatime,gid=3009,hidepid=2)
sysfs on /sys type sysfs (rw,seclabel,relatime)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
tmpfs on /mnt type tmpfs (rw,seclabel,nosuid,nodev,noexec,relatime,size=1803612k,nr_inodes=450903,mode=755,gid=1000)
none on /acct type cgroup (rw,relatime,cpuacct)
tmpfs on /tmp type tmpfs (rw,seclabel,relatime,size=1803612k,nr_inodes=450903)
pstore on /sys/fs/pstore type pstore (rw,seclabel,relatime)
none on /config type configfs (rw,relatime)
adb on /dev/usb-ffs/adb type functionfs (rw,relatime)
mtp on /dev/usb-ffs/mtp type functionfs (rw,relatime)
ptp on /dev/usb-ffs/ptp type functionfs (rw,relatime)
/dev/block/sda20 on /metadata type ext4 (rw,seclabel,relatime,data=ordered)

/tmp/recovery.log:
recovery.log

dmesg: (https://github.com/TeamWin/Team-Win-Recovery-Project/files/3388368/twrpdmesg.txt)

twrppartitions.txt

[abear1538]

So uh, it's October and nobody's bothered to fix or even look at this.

[ldoench]

So uh, it's October and nobody's bothered to fix or even look at this.

This might be the issue https://www.androidpolice.com/2019/10/24/android-10-twrp-pixel-3-4/

But since the Pixel 4 just recently got an Update, fingers crosssed, that it will also work on Pixel 3 (XL) in the next time: https://android.gadgethacks.com/how-to/install-twrp-recovery-your-pixel-4-4-xl-0318090/