Based on the provided knowledge sources, there isn't a direct solution to your specific problem. However, there are discussions and issues related to the handling of special characters and objects in query parameters in the low-code CDK. For instance, there's an issue about [URL-encoding every special character in Query Parameter values](
https://github.com/airbytehq/airbyte/issues/29918) and another one about [supporting query params in OData format without encoding](
https://github.com/airbytehq/airbyte/issues/29258). These discussions suggest that the handling of special characters in query parameters is a known concern. However, the specific issue of a space being replaced by a '+' is not directly addressed in these sources. I would recommend raising this as an issue in the [Airbyte Github repository](
https://github.com/airbytehq/airbyte/issues) to get a more specific solution or workaround for your problem.