theia: Frontend plugins are broken

root INFO Theia app listening on http://0.0.0.0:3000.
root INFO PluginTheiaDirectoryHandler: accepting plugin with path /home/mmorhun/projects/theia/plugins/2222
root INFO Deploying frontend plugin "2222@0.0.1" from "dist/2222-frontend.js"
root INFO Detected keyboard layout from browser API: US (PC)
root WARN Collided keybinding is ignored;  {"command":"editor.action.toggleTabFocusMode","keybinding":"ctrl+m"}  collided with  {"command":"core.toggleMaximized","keybinding":"ctrl+m"}
root WARN Could not register keybinding:
  {"command":"editor.action.toggleTabFocusMode","keybinding":"ctrl+m"}
Error: "ctrl+m" is in collision with something else [scope:0]
root WARN Collided keybinding is ignored;  {"command":"passthrough","keybinding":"ctrl+k","context":"terminalActive"}  collided with  {"command":"terminal:clear","keybinding":"ctrlcmd+k","context":"terminalActive"}
root WARN Could not register keybinding:
  {"command":"passthrough","keybinding":"ctrl+k","context":"terminalActive"}
Error: "ctrl+k" is in collision with something else [scope:0]
root INFO Using Git [2.23.0] from the PATH. (/usr/bin/git)
root INFO [nsfw-watcher: 84352] Started watching: /home/mmorhun/.theia
root WARN EditorNavigationContribution.onStart is slow, took: 558.870000000752 ms
root INFO Changed application state from 'init' to 'started_contributions'.
root INFO Changed application state from 'started_contributions' to 'attached_shell'.
root INFO >>> Restoring the layout state...
root INFO Checking whether '--no-optional-locks' can be used with the current Git executable. Minimum required version is '2.15.0'.
root INFO '--no-optional-locks' is a valid Git option for the current Git version: '2.23.0'.
root INFO [nsfw-watcher: 84352] Started watching: /home/mmorhun/projects/che-theia-samples
root INFO [bd20cf06-6b45-49a2-8fc0-47027ab3b76b] Sync of 1 plugin took: 171.91000000093482 ms
root INFO [nsfw-watcher: 84352] Started watching: /home/mmorhun/projects/che-theia-samples/.theia/tasks.json
root INFO [nsfw-watcher: 84352] Started watching: /home/mmorhun/projects/che-theia-samples/.theia/launch.json
root INFO [nsfw-watcher: 84352] Started watching: /home/mmorhun/projects/che-theia-samples/.theia/settings.json
root INFO [nsfw-watcher: 84352] Started watching: /home/mmorhun/projects/che-theia-samples/samples/key-value-storage/src/key-value-storage-frontend.ts
root INFO [nsfw-watcher: 84352] Started watching: /home/mmorhun/projects/che-theia-samples
root INFO [hosted-plugin: 84391] PLUGIN_HOST(84391) starting instance
root INFO <<< The layout has been successfully restored.
root INFO Changed application state from 'attached_shell' to 'initialized_layout'.
root INFO [bd20cf06-6b45-49a2-8fc0-47027ab3b76b][theia.2222]: Loaded contributions.
root INFO [bd20cf06-6b45-49a2-8fc0-47027ab3b76b] Load contributions of 1 plugin took: 0.5850000015925616 ms
root ERROR Failed to start plugins for 'frontend' host Error: not supported
    at Object.get rawModel [as rawModel] (http://localhost:3000/worker-ext.7e4110dacb549bd37efd.js:12876:35)
    at http://localhost:3000/worker-ext.7e4110dacb549bd37efd.js:38578:45
    at Object.init (http://localhost:3000/worker-ext.7e4110dacb549bd37efd.js:12880:35)
    at PluginManagerExtImpl.<anonymous> (http://localhost:3000/worker-ext.7e4110dacb549bd37efd.js:39004:60)
    at step (http://localhost:3000/worker-ext.7e4110dacb549bd37efd.js:38875:23)
    at Object.next (http://localhost:3000/worker-ext.7e4110dacb549bd37efd.js:38856:53)
    at http://localhost:3000/worker-ext.7e4110dacb549bd37efd.js:38850:71
    at new Promise (<anonymous>)
    at ../../packages/plugin-ext/lib/plugin/plugin-manager.js.__awaiter (http://localhost:3000/worker-ext.7e4110dacb549bd37efd.js:38846:12)
    at PluginManagerExtImpl.../../packages/plugin-ext/lib/plugin/plugin-manager.js.PluginManagerExtImpl.$start (http://localhost:3000/worker-ext.7e4110dacb549bd37efd.js:38999:16)
root INFO [bd20cf06-6b45-49a2-8fc0-47027ab3b76b] Start of 0 plugins took: 831.0050000000047 ms
root INFO [bd20cf06-6b45-49a2-8fc0-47027ab3b76b] Sync of 0 plugins took: 57.655000000522705 ms
root INFO [bd20cf06-6b45-49a2-8fc0-47027ab3b76b] Load contributions of 0 plugins took: 0.019999999494757503 ms
root INFO Changed application state from 'initialized_layout' to 'ready'.
root INFO [bd20cf06-6b45-49a2-8fc0-47027ab3b76b] Start of 0 plugins took: 58.98499999966589 ms