Groups.yaml "entity not available" - something has changed?

I have had home assistant running on my pi for a long time, my groups.yaml worked perfectly in the past. I do not use custom lovelace or cards, just the default.

When I try to add new entities to my groups.yaml I have a new problem that I guess came with a HA update. In the Overview I see an error such as

“entity not available: light.dimmer4”

for EVERY new entity I add to old groups or new groups. None of the entities I add now to groups.yaml are available, the old ones all work fine. Did something change, do I need to find and delete or add new Entity_ID for every entity I want to add to a group?

  dimmers:
    name: Dimmers
    entities:
      - light.hallway_dimmer
      - light.hallway_dimmer_2
      - light.bathroom_dimmer
      - light.dimmer4
      - light.dimmer5
      - light.kitchen_dimmer

  test:
    name: Test
    entities:
      - light.hallway_dimmer_2
      - light.bulb_rgbww10
      - light.bulb_rgbww11

After modifying a group in groups.yaml are you either restarting Home Assistant or, more conveniently, executing: Configuration > Server Controls > Reload Groups?

Does light.dimmer4 exist in Developer Tools → States?

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I try both methods of reloading groups. The shortcut and a full supervisor reboot.
Hmm, maybe I have to delete the database? Reinstall HA?

Please read @Tinkerer’s response and attempt to answer his question.

Yes everything works normally and shows up, except when it is in Groups.

Please attach a screen shot of these devices in the developer tools -> states page

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