Sequence parsing in version 5 fails

Since version 5 this rather simple yaml no longer parses corectly:
```yaml
abc: 5
cba:
  - Xyz
  - Zyx
```
```
YAMLException: end of the stream or a document separator is expected (2:1)

 1 | ﻿abc: 5
 2 | cba:
-----^
 3 |   - Xyz
 4 |   - Zyx
```