1.4.4 Incorrect image size is displayed

[pkvaipc4j0]

0.99.7: <short bug title>

XnView: MP 1.4.4 - 64 bit
OS: Windows 10 - 64bit

The image size of the attached webp file is 816x624.

test.zip

816x624 webp image

(719 Bytes) Downloaded 28 times

However, on the browser screen, it is displayed as 1x1.

[user0]

it displays as 3frame anim 816x624 for me

[xnview]

it's the size of first frame

[pkvaipc4j0]

In the properties window displayed on the left, it is displayed as width 816, height 624.
Why are different values displayed?
How can I make it display the same value?