Union ("|") and Interception ("&") QuerySets raise AssertionError

[AbrahamGo]

We are currently working to migrate a project from Django 1.5.12 to 1.7.11 and we are currently receiving the following error in Django 1.7.11 when we are using union ("|") or interception ("&" ) between QuerySets, for example queryset_c = queryset_a | queryset_b.

AssertionError: assert set(['T6', 'T...encyaccount']) == set([])
         Extra items in the left set:
         'clients_client'
         'reconciliation_asset'
         'T8'
         'T6'
         'settlements_currencyaccount'
         'core_entity'
         Use -v to get the full diff

Investigating we have noticed that it's a bug fixed in Django 1.8.5 but we need to know if there is any work around to this issue in Django 1.7.11 or we should redo this logic to avoid use "|" and "&" operators.

Could you let me know if there is any work around please?

Thanks.