Fix unflatten with field names like . .x or x..y (#1735)
#1566
| Job | Run time |
|---|---|
| 3m 32s | |
| 3m 32s |
. .x or x..y (#1735)
#1566
| Job | Run time |
|---|---|
| 3m 32s | |
| 3m 32s |