Using: NET 8, Entity Framework Core 10.0.0 , Microsoft.EntityFrameworkCore 7.0.17
Server: Firebird 3.

We are migrating our NET 4.8 solution to NET 8. Updated EF providers to EF Core.
A lot of queries are now coming up with following exception:

"Dynamic SQL Error\r\nSQL error code = -104\r\nToken unknown - line 3, column 1\r\nOUTER"

It's a pretty basic query:

var items= dbContext.Items.Where(x => relatedItemIds.Contains(x.RelatedItemId).Select(c => new { c.Id, c.State, c.ModifiedBy c.ModifiedDate, SubItems = c.SubItems.Select(y => new SubItemData() { y.ID, y.State, y.ModifiedBy, y.ModifiedDate, }) }).ToList();

This generates a working query with LEFT OUTER JOIN on .NET provider, but uses OUTER APPLY on the new NET Core provider - which Firebird does not support.