Retrieving testcases using testplanID and buildID is not working as expected

[Shital-arch]

Hi Everyone,
I am in the process of extracting test cases from Testlink through the method getTestCasesForTestPlan(test_plan_id, Buildid), but it is retrieving all test cases instead of limiting the results to those assigned to the particular build.
Lets consider, I have a test plan titled "TestcaseExecution" that includes two builds. The first build, "ALL_Testcases," contains 55 assigned test cases, while the second build, "priority_HIGH_Testcases," has 12 assigned test cases.
However, when retrieving test cases using the "TestcaseExecution" test plan with the "priority_HIGH_Testcases" build, all 55 test cases are being selected for execution.
I would appreciate any assistance regarding this issue