When using a custom placeholder that has a script, the placeholder content gets replaced with an array, instead of a string.
Example:
```yaml
preview:
- /social/c7a0190c-831b-4019-a44a-692af75f95b9.png
```
This should be:
```yaml
preview: /social/c7a0190c-831b-4019-a44a-692af75f95b9.png
```
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When using a custom placeholder that has a script, the placeholder content gets replaced with an array, instead of a string.
Example:
This should be: