Issue can be reproduced on the Radzen Blazor Components demo page:
Consider the following scenario in the "Multiple Selection with chips:
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All of the following items are disabled items, and selected in the drop down
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Per my expectations and the disabled state of the items, I am unable to click the X in the chip, or click the item in the dropdown to remove its selected state.
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If I were to click select all in the drop down, all items become selected, again per my expectations
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My issue can be observed when I then, unclick the select all checkbox in the drop down. Note that all items, even the disabled and originally selected items have become unselected:
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The opposite is also true in the case where nothing is selected, the user can select all items, including disabled items via the select all checkbox in the drop down:
I feel like this is a bug, I would expect disabled item's state (selected or unselected) to be left alone when using the select all checkbox.