Frontstage is missing registered widgets

[bilalbaig3101]

Describe the bug

While upgrading itwin/presentation-component to 5.0.0. On doing so, I upgraded itwinjs-core to 4.4.0, appui to 4.9.0, and itwinui-react to 3. On app start, the viewer stage opens without the widgets, and on reopening, it shows the widgets. migration guideline: https://github.com/iTwin/presentation/wiki/5.x-migration-guide#breaking-changes Project: Studio Branch link: https://github.com/iTwin/studio/tree/bilal/upgrade-presentation-component

To Reproduce

• pnpm i
• pnpm build
• cd packages/framework
• pnpm start (desktop app will launch)
• select project
• select imodel

Expected Behavior

No response

Screenshots

First time (without widgets) Other times (with widgets)

Desktop (please complete the applicable information)

No response

Additional context

No response

[johnnyd710]

I believe this is caused because of where we call loadUiItems in the visualizer app. If we register ui items earlier (e.g., during app startup) the issue will be resolved. Any idea why?

[GerardasB]

Haven't had the chance to debug it yet, but I'll try and register a provider from content group getter.