Lovelace throwing ‘lit-element’ module error on iOS 12.5.4 since upgrade to HA 2021.6.x

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This is cross-posted to the bug tracker, but as I know the developers are busy, I was hoping for some crowd-sourced wisdom.

Since upgrading to 2021.6.x, my older iPad running 12.5.4 can no longer display any Lovelace dashboard. Instead, it continually refreshes. When I connect to the console, I see the following error:

The main 'lit-element' module entry point is deprecated. Please update your imports to use the 'lit' package: 'lit' and 'lit/decorators.ts' or import from 'lit-element/lit-elements.ts'.

I have removed all custom-components etc. from my configuration to try to troubleshoot, but still see the error. I have cleared the cache, restarted HA… all the obvious things. Why is the dashboard still trying to use the older version of lit-element?

Here is the relevant part of my configuration:

# Lovelace section
lovelace:
  mode: yaml
  # resources:
    # - url: /hacsfiles/mini-media-player/mini-media-player-bundle.js
    #   type: module      
    # - url: /hacsfiles/lovelace-clock-card/clock-card.js
    #   type: module
    # - url: /hacsfiles/lovelace-darksky-card/lovelace-darksky-card.js
    #   type: module
    # - url: /hacsfiles/dual-gauge-card/dual-gauge-card.js 
    #   type: module
  dashboards:
    # lovelace-iphone:
    #   mode: yaml
    #   filename: lovelace-iphone.yaml
    #   title: iPhone
    #   icon: mdi:cellphone-iphone
    #   show_in_sidebar: true
    #   require_admin: true
    # lovelace-ipad-kitchen:
    #   mode: yaml
    #   filename: lovelace-ipad-kitchen.yaml
    #   title: iPadK
    #   icon: mdi:tablet-ipad
    #   show_in_sidebar: true
    #   require_admin: false      
    lovelace-test:
      mode: yaml
      filename: lovelace-test.yaml
      title: test
      icon: mdi:tablet-ipad
      show_in_sidebar: true
      require_admin: false

Here is the lovelace config file:

title: Home

views:
  - title: Home
    icon: mdi:home  
    path: home
    badges: []
    cards:
      - type: vertical-stack
        cards:
          - type: entities
            title: Lights
            show_header_toggle: false
            entities:
              - entity: group.upstairs_lights
                name: upstairs
              - entity: group.mainfloor_lights
                name: main floor
              - entity: group.basement_lights
                name: basement
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