core: Cast: External URL is no longer resolvable in 0.115 and some integrations fail to pull it properly

The problem

I was trying to play with the new stream features and went to cast a camera and I got an error in the logs:

Failed to cast media https://192.168.1.48:8123/api/hls/dfa768e11fafe3ae1eb8b29f8fe83c26111bc8cfbace4411d8035f60af521bbe/playlist.m3u8 from internal_url (https://192.168.1.48:8123). Please make sure the URL is: Reachable from the cast device and either a publicly resolvable hostname or an IP address
Failed to cast media https://www.home-assistant.io/images/cast/splash.png. Please make sure the URL is: Reachable from the cast device and either a publicly resolvable hostname or an IP address
Failed to cast media https://DOMAIN:8123/api/tts_proxy/a94a8fe5ccb19ba61c4c0873d391e987982fbbd3_en_-_google_translate.mp3 from external_url (https://DOMAIN:8123). Please make sure the URL is: Reachable from the cast device and either a publicly resolvable hostname or an IP address

Example from Cast: https://github.com/home-assistant/core/blob/dev/homeassistant/components/cast/media_player.py#L364

My own configuration that shows I have external URL configured:

homeassistant:
  name: Home
  latitude: !secret home_lat
  longitude: !secret home_long
  elevation: 739
  unit_system: imperial
  time_zone: America/Los_Angeles
  customize: !include customize.yaml
  external_url: !secret baseurl

Environment

• Home Assistant Core release with the issue: 0.115.1
• Last working Home Assistant Core release (if known): 0.114.3
• Operating environment (OS/Container/Supervised/Core): Core
• Integration causing this issue: Cast, TTS, Camera possibly Stream, more than a likely a core call is failing
• Link to integration documentation on our website:

Problem-relevant configuration.yaml

service: camera.play_stream
entity_id: media_player.den_home_hub
media_player: camera.baby_monitor

Traceback/Error logs

Failed to cast media https://192.168.1.48:8123/api/hls/dfa768e11fafe3ae1eb8b29f8fe83c26111bc8cfbace4411d8035f60af521bbe/playlist.m3u8 from internal_url (https://192.168.1.48:8123). Please make sure the URL is: Reachable from the cast device and either a publicly resolvable hostname or an IP address
Failed to cast media https://www.home-assistant.io/images/cast/splash.png. Please make sure the URL is: Reachable from the cast device and either a publicly resolvable hostname or an IP address
Failed to cast media https://DOMAIN:8123/api/tts_proxy/a94a8fe5ccb19ba61c4c0873d391e987982fbbd3_en_-_google_translate.mp3 from external_url (https://DOMAIN:8123). Please make sure the URL is: Reachable from the cast device and either a publicly resolvable hostname or an IP address

Additional information

The TTS call was successful but the camera stream was not successful so I am not 100% sure if that is the issue.