Steps to reproduce:

• Case A:
  1. Open Trigger (or graph, discovery rules, web scenarios) list for host
  2. Add some filter, click Apply
  3. Open host edit form and click Delete
• Case B:
  1. Open Trigger (or graph, discovery rules, web scenarios) prototypes list for host
  2. Add some filter, click Apply
  3. Open host edit form and click Delete

Result:

• Case A: list is reloaded, but filters are not cleared (except deleted host)
• Case B: List of discovery rules are displayed, but filters are not cleared (except deleted host)

Expected:
Behaviour should be the same as from Item / Item prototype: all filters should be cleared.