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There could be several reasons why Entity Framework Core is generating an error when inserting records in a partitioned table. Some of the possible reasons include:

1. Partition key constraint violation: If the partition key value provided for the new record violates the partition key constraint, EF Core will generate an error. For instance, if the partition key is based on date and the new record has a date outside the allowed range, EF Core will fail.

2. Indexing issues: If the partitioned table has indexes that are not aligned with the partition boundaries, EF Core may not be able to insert records correctly. This can happen if the indexes are partitioned differently or if they are not partitioned at all.

3. Incompatible data types: If the data types used for the partition key column and the corresponding column in the new record are incompatible, EF Core will generate an error.

4. Incorrect schema mapping: If the mapping between the EF model and the underlying database schema is incorrect, EF Core may not be able to insert records correctly. This can happen if the partitioning scheme is not properly defined in the database schema.

5. Concurrency issues: If multiple clients are attempting to insert records concurrently, EF Core may encounter concurrency issues that prevent it from inserting records correctly. This can happen if the partitioned table is not properly protected against concurrent access.