EF: Can I mix TPH and TPT when abstract base and a few concrete types are in TPH-table and other types have their own table?

问题

First of all, these questions are similar but definitely not the same:

Can I mix Table per Hierarchy and Table per Type in Entity Framework? - Refers to a different scenario.

Entity Framework: mix table per type and table per hierarchy - Yet another scenario, that despite accepting answer to first scenario is not related to it (*).

(*) Second of all, I have sucessfully mixed table-per-type and table-per-hierarchy in Entity Framework, when base entity is mapped using table-per-entity and the table with the discriminator of the table-per-hierarchy is lower down the chain.

I am trying to map the following:

Tables:

BaseTable
{
    int PK1;
    int PK2;
    string? Value1;
    double? Value2;
}

ChildTable3
{
    int PK1;
    int PK2;
    int Value;
}

Entities:

abstract BaseEntity : class // Maps to BaseTable
{
    int PK1; // Maps to PK1 in relevant table
    int PK2; // Maps to PK2 in relevant table
}

Entity1 : BaseEntity // Maps to BaseTable when Value1 != null
{
    string Value; // Maps to Value1
}

Entity2 : BaseEntity // Maps to BaseTable when Value1 == null && Value2 != null
{
    double Value; // Maps to value2
}

Entity3 : BaseEntity // Maps to ChildTable3
{
    int Value; // Maps to value
}

Prior to adding Entity3 mappings worked.

After adding Entity3 and its mapping, I receive the following error while compiling:

Error 1 Error 3026: Problem in mapping fragments starting at lines 980, 986, 995:Data loss or key constraint violation is possible in table BaseTable. An Entity with Key (PK) will not round-trip when: (PK is in 'BaseTables' EntitySet AND Entity is type [MyNamespace.Entity3]) Path\To\My.edmx 981 15 MyAssembly