The application can trigger edit mode through the Gantt state, similar to the how you can trigger edit mode programmatically in the Grid. However, in this case, the Gantt edit form does not show the tabs for editing dependencies and custom model properties.

Test page with a possible JavaScript-based workaround (it requires the item to edit to be rendered:

https://blazorrepl.telerik.com/cpOKmIuC29Unl2B429

When double-clicking a task in the Gantt Timeline, the popup edit form may not appear. Instead, the vertical blue band for task dragging may show.

The problem is more likely to occur when using a touchpad.

When the Start and End Dates are far from the DateTime.Now, Gantt freezes the entire application. 

1. Go to https://demos.telerik.com/blazor-ui/gantt/templates

2. Scroll to the end of the timeline horizontally

3. Move the mouse pointer to timelineTooltip appears in the wrong place

The FilterMenuType Parameter is available for GanttColumns but is is ignored.  The FilterMenuType of TelerikGantt is always used.

In the Timeline numeric editor the increase/decrease step is 0.01. However, the increase/decrease step of the Gantt Tree numeric editor is 1.  This allows you to increase the Percent Complete value to higher than 1(standing for 100%) and thus break the component.