flutter/packages#6201 introduced the following code:

    if (ActivityResultContracts.PickVisualMedia.isSystemPickerAvailable$activity_release()) {
      return MediaStore.getPickImagesMaxLimit();
    } else {
      return Integer.MAX_VALUE;
    }

isSystemPickerAvailable... is not part of the docs, and looking locally in the IDE I see that this is a function marked internal, so if I'm understanding correctly, it should never have been used. Based on b/455864474 it appears that this will prevent working with activityx.activity 1.12.0.