[BUG] Serialization emits invalid file with missing sections about serde-yaml HOT 3 OPEN

"Stray :" is not necessarily invalid YAML. You are just showing an excerpt of the output but the following is valid YAML syntax:

?
    SelectionMarker:
      color:
        r: 1.0
        g: 1.0
        b: 1.0
      is_visible: true
      is_selected: false
:
      food: 30.0
      food_current: 30.0
      water: 20.0

from serde-yaml.

Since what you showed is valid YAML, this issue is not going to be actionable unless you can provide a minimal repro of incorrect behavior.

from serde-yaml.

There is no ? before in the file. There is simply content missing at the location where the : appears in the file. The emitted file does not pass the serialize - deserialize test and panics during deserialization with serde_yaml.

When I switch to JSON by simply replacing serde_yaml::to_writer with serde_json::to_writer_pretty it is working fine.

from serde-yaml.