Steps to reproduce:

1. Create new webhook
2. Add script "return '{"tags":{"a":1}}';" and select "Process tags"
3. Add macros {EVENT.TAGS} and {EVENT.RECOVERY.TAGS} for message type "Problem recovery" in message template
4. Edit user and add media with this webhhok
5. Add tag triggerTag:test to trigger
6. Make trigger in problem state
7. Make trigger in resolved state
8. Check Reports -> Action log

Result:
{EVENT.TAGS} contains a:1, triggerTag:5
{EVENT.RECOVERY.TAGS} contains triggerTag:test
Expected:
{EVENT.RECOVERY.TAGS} contains a:1, triggerTag:test