Ubuntu Bionic 18.04.x was released with ZFS 0.7.5 and not 0.7.12. Ubuntu Disco 19.04 contained ZFS 0.7.11 and then 0.7.12 but this is now EOL.
Supported versions of ZFS are as follows:
Xenial: 0.6.5.6 Bionic: 0.7.5 Focal: 0.8.3 Groovy: 0.8.4
0.7.12 is EOL. The bug you are referring to has the fixes in the Focal and Groovy releases. Marking this as Won't Fix.
Ubuntu Bionic 18.04.x was released with ZFS 0.7.5 and not 0.7.12. Ubuntu Disco 19.04 contained ZFS 0.7.11 and then 0.7.12 but this is now EOL.
Supported versions of ZFS are as follows:
Xenial: 0.6.5.6
Bionic: 0.7.5
Focal: 0.8.3
Groovy: 0.8.4
0.7.12 is EOL. The bug you are referring to has the fixes in the Focal and Groovy releases. Marking this as Won't Fix.