Fancytree dnd5 triggering multiple loads of lazy nodes on hover

[dvstans]

I tried asking about this on stack overflow and got no response, so I'm posting here as well.

I just updated my application from the old Dnd extension to Dnd5 and I'm now seeing multiple/many server AJAX calls (usually 5 or 6) when I hover over lazy-load nodes while dragging. I have only implemented the dragStart, dragEnter, and dragDrop callbacks. When dragging over a lazy load node, I only see one dragEnter event callback triggered, but this is followed by a variable number of node loads. (I can't really see a pattern to why the number of loads varies.)

Is there some special handling or response required from the lazyLoad callback to prevent this? I should also point out that I also updated to the latest version of Fancytree (2.34.0) so perhaps something else has changed that is causing this? (My tree works fine otherwise.)

Expected and Actual Behavior

Expected: exactly one lazy load call when node auto expansion is triggered.
Actual: from 1 to up to 6 lazy load calls for the same node when auto expansion is triggered.

Note: old Dnd extension works as expected in same application.

Steps to Reproduce the Problem

I don't yet have a simplified example - if this is unexpected behavior (vs usage problem), I will create one.

Environment

• Latest version of Google Chrome (Ubuntu 18 and Windows 10), Firefox (Ubuntu), Edge (Windows 10)
• jQuery 1.12.4
• jQuery UI 1.12.1
• Fancytree version: 2.34.0
• Extensions: Dnd5, themeroller