The ComboBox doesn't reset its default state when removing the selected items with Ctrl+A && pressing the Delete/Backspace button.
This bug is a regression from the 2018 R3 version.
When selecting the first element in the list, the Combobox closes without adding a value to the ComboBox input.
When the "Vins et alcools Chevalier" value is selected , the value should be added in the ComboBox input and the dropdown should close.
Here is a Dojo demonstrating the correct behavior.
ComboBox with filtering option set to "contains".
Search for the last element in ComboBox dropdown and select it. Delete the selected item with mouse selection and "Delete" button. The dropdown will open again. Select the first element in the dropdown. It will close and no data will be selected. If we repeat the scenario and instead of selecting the first element, we select another one, everything is working properly.
This is regression introduced in 2018 R1 SP1
Please check this demo video.
Please check this demo video