The writable partition is corrupted using the latest ubuntu-image(0.8 )

I installed the latest ubuntu-image from git version, and the issue can be reproduced through following steps:

$ ubuntu-image --version
ubuntu-image 0.8+17.04ubuntu1
$ more pi3.model
type: model
authority-id: 9anEFsr3zJAqJ3zq2Rv2IdLys8p6353z
series: 16
brand-id: 9anEFsr3zJAqJ3zq2Rv2IdLys8p6353z
model: pi3
architecture: armhf
gadget: pi3
kernel: pi2-kernel
timestamp: 2016-09-24T16:16:24+00:00
sign-key-sha3-384: RfSxuO7R8OT_22IQMEOVHCFHrg68AZ4vPJgCqTZbkX8h9pZktEVbK2fVYQ6lf1P5
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$ sudo ubuntu-image -c beta -o pi3-test-new.img pi3.model
[sudo] password for u:
5.83 MB / 5.83 MB [===============================================================================================================================] 100.00 % 714.42 KB/s
Fetching ubuntu-core
63.42 MB / 63.42 MB [=============================================================================================================================] 100.00 % 279.58 KB/s
Fetching pi2-kernel
85.44 MB / 85.44 MB [=============================================================================================================================] 100.00 % 514.58 KB/s
Fetching pi3
5.83 MB / 5.83 MB [=================================================================================================================================] 100.00 % 2.41 MB/s
$ sudo kpartx -av pi3-test-new.img
add map loop2p1 (252:0): 0 262144 linear 7:2 2048
add map loop2p2 (252:1): 0 948224 linear 7:2 264192
$sudo mount /dev/mapper/loop2p2 mnt/
mount: wrong fs type, bad option, bad superblock on /dev/mapper/loop2p2,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.
$ dmesg|tail -n 2
[82470.253410] EXT4-fs (loop2): mounted filesystem with ordered data mode. Opts: (null)
[82493.633046] EXT4-fs (dm-1): bad geometry: block count 118616 exceeds size of device (118528 blocks)

But if I use the snap version (0.5+mvo13), mounting the second partition is OK.