When MediaWiki:GrowthExperimentsSuggestedEdits.json does not exist (or is empty) [1], then https://es.wikipedia.beta.wmflabs.org/wiki/Especial:CommunityConfiguration/GrowthSuggestedEdits behaves in a very confusing way. For example, the "Maximum number of links to show per task" looks like this:
As an user, I would interpret this as "there is no maximum number of links", expecting GrowthExperiments not to limit the number of links displayed at all. However, in practice, GrowthExperiments recognizes the number is missing (not provided at all), and enhances the configuration with its defaults. As such, when Maximum number of links to show per task" is empty, GrowthExperiments limits the number of links per task to 10.
This comes from GE-specific defaults (in this case, LinkRecommendationTaskType::DEFAULT_SETTINGS), but the behavior is not obvious from the form. It is also probably impossible to know what will happen without reading through our codebase, which is unfair to expect from the admins.
To resolve this, we should add defaults to the Suggested edits schema.
[1] This is the normal case at wikis where CommunityConfiguration is freshly enabled.