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@@ -557,7 +557,7 @@ class DynamicGrouping {
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// Removing.
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for ( const removedItem of changeData.removed ) {
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- if ( index > this.ungroupedItems.length ) {
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+ if ( index >= this.ungroupedItems.length ) {
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this.groupedItems.remove( removedItem );
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} else {
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this.ungroupedItems.remove( removedItem );
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