A tree node with checkboxes and pagination is removed from the tree when you open it

This can be reproduced on the Export tree if the following preconditions are met:

• you need a node that has a child pagination node
• this node must be closed and selected

Opening this node leads to this behavior:

• the first page of child nodes is loaded from the server and is displayed for a fraction of a second; the pagination node is the last of these child nodes
• since the parent node we opened was previously selected the tree attempts to select all child nodes that were just loaded
• when the pagination child node is selected it is actually activated, meaning that the next page of child nodes are loaded from the server
• this leads to a JavaScript error because the pagination node is activated too early, before the pagination node is completely drawn

TypeError: m[obj.children[i]] is undefinedjstree.js:2486:8
    redraw_node http://localhost:8080/xwiki/webjars/wiki:xwiki/jstree/3.3.8/jstree.js:2486
    redraw_node http://localhost:8080/xwiki/webjars/wiki:xwiki/jstree/3.3.8/jstree.js:5450
    create_node http://localhost:8080/xwiki/webjars/wiki:xwiki/jstree/3.3.8/jstree.js:3884
    addMoreChildren http://localhost:8080/xwiki/webjars/wiki:xwiki/xwiki-platform-tree-webjar/12.5-SNAPSHOT/tree.js:146
    each jQuery
    addMoreChildren http://localhost:8080/xwiki/webjars/wiki:xwiki/xwiki-platform-tree-webjar/12.5-SNAPSHOT/tree.js:142

As a result of the JavaScript error the parent node is removed from the tree.