Steps to reproduce:

• install pyzabbix
• request some problems, example:

  zapi.problem.get(time_from = start_time, time_till = till_time, source = 0, object = 0, recent = False, selectAcknowledges = 'count', selectTags = ['tag', 'value'], sortorder = 'DESC', output = 'extend')
  

  zapi.problem.get(time_from = start_time, time_till = till_time, source = 0, object = 0, recent = True, selectAcknowledges = 'count', selectTags = ['tag', 'value'], sortorder = 'DESC', output = 'extend')
  

Result:
Only recent/current problems reported.

Expected:
All, for the time period used: time_from, time_till.