This has been fixed in the e2fsprogs version in Disco.
[ 8:40AM 10668 ] [ bdmurray@impulse:/tmp/e2fsprogs-1.44.5 ]
$ grep -B1 1798562 doc/RelNotes/v1.44.5.txt
Fix a bug where resize2fs was failing to update the extent tree
checksums in an corner case. (Addresses Launchpad Bug: #1798562)
This has been fixed in the e2fsprogs version in Disco.
[ 8:40AM 10668 ] [ bdmurray@ impulse: /tmp/e2fsprogs- 1.44.5 ] v1.44.5. txt
$ grep -B1 1798562 doc/RelNotes/
Fix a bug where resize2fs was failing to update the extent tree
checksums in an corner case. (Addresses Launchpad Bug: #1798562)