When using Test Case Importer, the Test Step custom field does not take into consideration the project's aim to import

Description
When using Test Case Importer, the Test Step custom field does not take into consideration the project's aim to import

How to reproduce

1. Create a test step custom field in Project B;
2. Use the Test Case Importer;
3. Select Project A;
4. While searching for Test Steps custom fields of Project A, the created-in Project B is showing up;

Actual result/Attachments

Expected result
Only the Test Step custom field created for that project should be showing.