Select can not set datasource and bind-Value at the same time

[rq204]

Describe the bug

when I change Select DataSource then I change bind-Value，the bind-Value can't work。

Steps to reproduce (please include code)

Index.razor.txt

[esailes]

add await Task.Yield();

await Task.Yield(); _selectedValue = 6;

#1536

[anranruye]

Should not be _selectedValue=5. It is expected to get no item selected when set value to 5 because this item is disabled. However, here is indeed an issue/bug. To reproduce this issue, use other values (eg 6) instead.