2022.11 default theme overwriting custom one at times

Configuration Frontend
1

Hi,
I’m using following theme with card-mod to get rid of the new default mushroom theme introduced in 2022.11

Using:

no-borders:
  modes:
    dark:
      text-color: '#ffffff'
  card-mod-theme: no-borders
  card-mod-root-yaml: |
    .: |
      ha-app-layout {
        --ha-card-border-width: 0px;
        --ha-card-border-radius: 1px
      }

It works great, but every now and then I load ha dashboard and see the atrocious bubbly round corners and borders everywhere and I have to do CTRL+SHIFT+R to get back to my theme. This is not much of an issue on pc, but on phone it’s a hassle to clear cache.

How would I go about ensuring I never see the mushroom theme again?

Thanks!