Some properties, like `${decoder-list}`, are resource-intensive to
expand. Prevent fuzzing from generating strings with excessive
expansions to encourage shorter test cases.
Expanding properties on each playback frame for `osd-msg1` can be
demanding. However, in regular use cases, this typically isn’t an issue,
so implementing a caching solution wouldn’t be practical in real
scenarios.
Fixes timeouts on OSS-Fuzz.