Steps to Reproduce

Run fiddle

https://zkfiddle.org/sample/25i2bpb/3-listbox-select-event

Click on the button

Open select, choose Item 2

Open select, choose Item 1

Current Result

Only the first onSelect event after clicking button is triggered, other selections after that fail to trigger

Expected Result

selection should work

Debug Information

Caused by desync between listbox._selectedIndex and individual listitem.isSelected() at client-side.

{"rs":[["rm",["o9lS9"]],["rm",["o9lS4"]],["addChd",["o9lS2",[ //REMOVING THE OLD LISTITEMS, this should clear selectedIndex from listbox, but since the items are no longer bound, it fails to do so.
['zul.sel.Option','o9lS5',{selected:true,_loaded:true,_index:0},{},[ //Created with selected state
['zul.sel.Listcell','o9lS6',{label:'item 1'},{},[]]],'select']],[
['zul.sel.Option','o9lS3',{_loaded:true,_index:1},{},[
['zul.sel.Listcell','o9lSa',{label:'item 2'},{},[]]],'select']]]],["setAttrs",[{$u:'o9lS2'},["_lastoffset",0,"resetDataLoader",true,"$onDataLoading",true,"$onTopPad",false,"visibleItemCount",2,"selectedIndex",0]]]],"rid":5}

When selecting item2 after triggering the model / selection replacement, item2 becomes selected, but item1 doesn't become unselected, because the listbox.clearSelection() tries to unselect the previous listitem widget (from listbox._selItems), instead of unselecting the currently selected item.

Workaround

listbox.invalidate(); after setting model / selection