FlowJoin with WaitAll mode not wating

The FlowJoin with WaitAll mode is not behaving as expected. When there is a loop in one of the branches, the other branch does not wait properly. The previous bookmark is removed, and the running activity gets canceled. What is the recommended way to implement parallel branches with loopbacks in a Flowchart?

this is my code:

`
new Connection(new Endpoint(fork, "cost"), new Endpoint(employeeMissionExpenseActivity)),
new Connection(new Endpoint(employeeMissionExpenseActivity), new Endpoint(supervisorMissionExpenseApprovalActivity)),
new Connection(new Endpoint(supervisorMissionExpenseApprovalActivity), new Endpoint(handleSupervisorMissionExpenseApprovalActivity)),
new Connection(new Endpoint(handleSupervisorMissionExpenseApprovalActivity, "True"), new Endpoint(managerMissionExpenseApprovalActivity)),
new Connection(new Endpoint(handleSupervisorMissionExpenseApprovalActivity, "False"), new Endpoint(employeeMissionExpenseActivity)),
new(new Endpoint(managerMissionExpenseApprovalActivity), new Endpoint(handleManagerMissionExpenseApprovalActivity)),

new Connection(new Endpoint(handleManagerMissionExpenseApprovalActivity, "True"), new Endpoint(joinReportAndCost)),
new Connection(new Endpoint(handleManagerMissionExpenseApprovalActivity, "False"), new Endpoint(employeeMissionExpenseActivity)),

new Connection(new Endpoint(joinReportAndCost), new Endpoint(checkReportAndExpenseApprovalActivity))`