TYPO3 Core

I have the following setup like in the core seo hreflang tests.

rootPageId: 1
base: http://localhost/
languages:
  - title: English
    enabled: true
    languageId: 0
    base: /
    typo3Language: default
    locale: en_US.UTF8
    iso-639-1: en
    navigationTitle: English
    hreflang: en-US
    direction: ltr
    flag: en-us-gb
    websiteTitle: ''
  - title: German
    enabled: true
    base: /de/
    typo3Language: de
    locale: de_DE.UTF8
    iso-639-1: de
    websiteTitle: ''
    navigationTitle: Deutsch
    hreflang: de-DE
    direction: ltr
    fallbackType: strict
    fallbacks: ''
    flag: de
    languageId: 1
  - title: 'Swiss German'
    enabled: true
    base: /de-ch/
    typo3Language: de
    locale: de_CH.UTF8
    iso-639-1: de
    websiteTitle: ''
    navigationTitle: Schweiz
    hreflang: de-CH
    direction: ltr
    fallbackType: fallback
    fallbacks: '1'
    flag: ch
    languageId: 2

So the language 2 points only to language 1 as fallback, not to the default language. When there is no translation given, I can not call the url /de-ch/ without an error. But in the language menu and hreflang this version is specified. Correct would be:
1. If there is no translation, don't show any hreflang.
2. Specify the hreflang for language 2, if there is a translated record in lanuage 1 or language 2.