Fix threading by carrying forward span reference in use_scope
#5006
| Job | Run time |
|---|---|
| 3m 40s | |
| 5m 8s | |
| 5m 37s | |
| 5m 47s | |
| 5m 23s | |
| 6m 32s | |
| 6m 22s | |
| 1s | |
| 38m 30s |
use_scope
#5006
| Job | Run time |
|---|---|
| 3m 40s | |
| 5m 8s | |
| 5m 37s | |
| 5m 47s | |
| 5m 23s | |
| 6m 32s | |
| 6m 22s | |
| 1s | |
| 38m 30s |