Database provider: Microsoft.EntityFrameworkCore.SqlServer
Target framework: NET 5.0

When creating a unique index on a nullable column, the index is created with a 'where not null' clause. If however the column is not nullable, this is of course omitted. I'm now trying to change a column from 'not nullable' to 'nullable', containing such an index. This fails because the index isn't being altered either.

Microsoft.Data.SqlClient.SqlException
  HResult=0x80131904
  Message=The index 'UX_***************' is dependent on column '********'.
ALTER TABLE ALTER COLUMN *********** failed because one or more objects access this column.