Thanks to the latest Google restrictions, the app MUST be excluded from the device's Optimized App list in order to work properly.
Without it, many basic features of the app will not work properly, such as Automatic download, Resuming podcast update after a network failure, Resuming playback when connecting to a headset, ...
Google now offers new ways for apps to handle these tasks, BUT only for some of the app's features. The other features will not be able to work anymore on devices Running Android 12 or newer unless the user excludes the app from the device's Optimized App list.
Even the new recommended methos are not garanteed to work, as it depends on a Quota that will be set by the device manufacturer. So maybe the first few calls to these services will be able to work before being denied by the device.
That's why the app must be set to Unrestricted in the device's Battery settings, so that it can keep working as usual. Of course this will have no negative effect on the app battery usage, because it just means that the app will be able to do its job and nothing more.
Feel free to contact me if you have any questions.