msrc attribute is not working

[Allan1]

Clone dummy app, set msrc attributes for each item in the items array and run.
For the first clicked image I can see that the larger image is downloaded however it is not shown.
For the next clicked image the larger version is not even downloaded.
In both cases, the short image is shown when expanded.

ember-cli-photoswipe: 1.2.0
ember-cli: 2.14.0
node: 6.10.2
os: win32 x64