drag an element（F element） from A container to the B container, and the dragged element position absolute bottom of the B container, but then other elements cannnot drop to the B container, why????and how to solve?

[babyyage]

drag an element（F element） from A container to the B container, and the dragged element position absolute bottom of the B container, but then other elements cannnot drop to the B container, why????and how to solve?

Jsfiddle link

https://codepen.io/babyyage/pen/yLqJGjg

Step by step scenario

Step One: drag F element to the B container Step Two:drag other element to the B container but failed

Actual Solution

cannot drag other element to the B container but failed

Expected Solution

first drag F element to the B container and also can drag other element to the B container

[babyyage]

hi~~ @David-Desmaisons i'm sorry that @ and bother you , i need help to solve this question