jQuery UI sortable "forcePlaceholderSize" doesn't work with Firefox??

jQuery UI sortable "forcePlaceholderSize" doesn't work with Firefox??

Hi,

I set forcePlaceholderSize to true. In Chrome, a new placeholder div is created with inline CSS height property.
<div class="sortable-placeholder" style="height: 92px;" ></div>


But if I run the same code in Firefox (v 43.0.4), the newly created div placeholder doesn't has a height style.
<div class="sortable-placeholder"></div>


I know I could set the height in the sortable-placeholder class. I just wonder why forcePlaceholderSize does not work with Firefox.

Please see below for my test code
https://jsfiddle.net/Lgqt1ns7/1/

    



Thanks.