MultiSelectComboBox with allowCustomValue loses custom values on Tab and blur events

[Jofresh77]

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Describe the bug

When using a custom created MultiSelectComboBox component with setAllowCustomValue set to true, only the key down event for Enter will apply the custom option to the combo-box. No other events can pass in the entered value to the component, if any other events is applied, the entered value will be deleted.

Expected-behavior

• Event key down for Tab key -> should also apply the custom value or at least keep it visible in the field.
• Blur event -> should also apply the custom value or at least keep it visible in the field.

Reproduction

Link to example project Launch the provided example project, enter a value inside the MultiSelectComboBox, then do one of the following:

• Key down Enter -> works fine
• Key down Tab -> value gets deleted
• Blur event -> value gets deleted

System Info

• OS: macOS Sequoia 15.5
• Vaadin version: 24.7.5
• Browser: Chrome