Same deal here on:

Distributor ID: Ubuntu
Description:    Ubuntu 19.04
Release:        19.04
Codename:       disco

Linux amdubuntu 5.0.0-29-generic #31-Ubuntu SMP Thu Sep 12 13:05:32 UTC
2019 x86_64 x86_64 x86_64 GNU/Linux

I'd just like to clarify that Comment #31 has the appropriate syntax for
multiple disks.

I'm not sure how I had this working before but as of the 5.0.0-29-generic 
kernel - if you have multiple entries in your 
/etc/modprobe.d/blacklist-<whateveryoucallit>.conf: 
options usb-storage quirks=0x0bc2:0xab20:u
options usb-storage quirks=0x0bc2:0xab00:u

They will clobber each other, so per the above you only would be
blacklisting 0x0bc2:0xab00:u.

You don't need 0x, if you want to cut down on the syntax a bit, but you do need 
to put them all on the same line:  
/etc/modprobe.d/blacklist-<whateveryoucallit>.conf: 
options usb-storage quirks=0bc2:ab20:u,0bc2:ab00:u,0bc2:3322:u,152d:1561:u

Note: if you have a /etc/modprobe.d/usb3-disk-bug.conf and create your own 
blacklist file make sure you remove the "options usb-storage quirks..." entries 
from usb3-disk-bug.conf to prevent them from clobbering your blacklist file. 
 
Update your initramfs: 
sudo update-initramfs -u

And reboot.

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https://bugs.launchpad.net/bugs/1584557

Title:
  Seagate external drive causes SCSI bus resets when UAS enabled

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