TYPO3 Core

Hi, could you post your site config and the redirect you are trying to configure?

It is working for me.

Site config:

rootPageId: 1
base: 'https://t3-master.ddev.site/'
languages:
  -
    title: English
    enabled: true
    languageId: '0'
    base: /
    typo3Language: default
    locale: en_US.UTF-8
    iso-639-1: en
    navigationTitle: English
    hreflang: en-us
    direction: ltr
    flag: us

My configuration:

rootPageId: 1
base: 'https://elarum.ru/'
baseVariants: {  }
languages:
  -
    title: Русский
    enabled: true
    languageId: '0'
    base: /
    typo3Language: ru
    locale: ru_RU.UTF-8
    iso-639-1: ru
    navigationTitle: Русский
    hreflang: ru-RU
    direction: ltr
    flag: ru
  -
    title: English
    enabled: true
    languageId: '1'
    base: 'https://elarum.com/'
    typo3Language: default
    locale: en_US.UTF-8
    iso-639-1: en
    navigationTitle: English
    hreflang: en-US
    direction: ltr
    fallbackType: strict
    fallbacks: ''
    flag: gb
  -
    title: Қазақ
    enabled: false
    languageId: '2'
    base: 'https://elarum.kz/'
    typo3Language: ru
    locale: kk_KZ.UTF-8
    iso-639-1: kk
    navigationTitle: Қазақ
    hreflang: kk-KZ
    direction: ''
    fallbackType: fallback
    fallbacks: '0'
    flag: kz
errorHandling:
  -
    errorCode: '404'
    errorHandler: Page
    errorContentSource: 't3://page?uid=85'
  -
    errorCode: '503'
    errorHandler: Page
    errorContentSource: 't3://page?uid=86'
routes:
  -
    route: sitemap.xml
    type: uri
    source: 't3://page?uid=1&type=1533906435'
routeEnhancers:
  PageTypeSuffix:
    type: PageType
    default: /
    suffix: /
    index: ''
    map:
      /: 0

Applied patches from Bug #88906
I get the error again.
Redirect not working

Patch set 1 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/61838

Applied in changeset 72a9cca0071008740ce391b8dc2175d9fc5af022.