Widgets - There was an error loading

[michalleptuch]

Describe the bug

Hello,

One of my clients reported that the widget for my Calendar Flyout app isn’t working on the new WinUI-based Widget Board. After a few seconds of loading, the following message appears on the widget: "There was an error loading". I've debugged my app and found nothing wrong with the code - no exceptions or issues with the template or widget data.

My agenda widget implements IWidgetProvider but not IWidgetProvider2.

Previously, when testing with private drafts of widgets on the new board, I encountered a similar issue but assumed it was due to the beta stage. I noticed that widgets with more complex templates would crash without a clear reason. Now, Microsoft has begun rolling out this update to European users on the public channel, and the issue still persists. As a publisher, what should I do?

I've also replicated the issue on another app, Battery Meter (https://www.microsoft.com/store/productId/9NTZK850350D).

Steps to reproduce the bug

1. Update Windows Web Experience Pack to version 524.28801.30.0
2. Enable new Widgets Board - features for EEA (European Economic Area): 49686193, 48433719, 47557358
3. Pin Calendar Flyout or Battery Meter (free) tile.

Expected behavior

Working widget

Screenshots

NuGet package version

Windows App SDK 1.6.1: 1.6.240923002

Packaging type

Packaged (MSIX)

Windows version

Windows 11 version 22H2 (22621, 2022 Update)

IDE

Visual Studio 2022

Additional context

Windows: 24H2 - 26100.2161 - x64
Windows App SDK: 1.6.240923002