How to change the default channel from "Production" to "Custom" at first start

we use ionic appflow together with the cordova plugin “cordova-plugin-ionic”.

As destinations we have defined the following in Ionic Appflow:

MDR_Android_Production
MDR_iOS_Production
Android_Production
Android_Staging
Android_Dev
iOS_Production
iOS_Staging
iOS_Dev

Additionally, we have defined automations for the “mdr/" branch and "release/” branch.

Currently, we build the native binary versions ourselves and also push them to the App Store or Google Play Store ourselves.
When building the native binaries we always adjust the CHANNEL_NAME in package.json for MDR_Android_Production, MDR_iOS_Production, etc.

However, when the app launches for the first time and you get the OTA update in “background” update mode, you will not get the updates via the default CHANNEL_NAME (MDR_Android_Production, etc.) changes but for the channel “Production” by default.

I thought the self-defined destinations were there so that you also receive updates at the start of the app via a custom channel and not via “Production”.