Preview error when using, in nested blocks, an Umb.PropertyEditorUi.ContentPicker on 3.0.0 with umbraco 15.1.1

[isIulian]

Which Umbraco.Community.BlockPreview version are you using?

3.0.0

Which Umbraco version are you using? For example: 10.4.0 - don't just write v10

15.1.1

Bug summary

In a umbraco project I'm using the packages blockgrid to create a block of products.
The products property is a Nested BlockList in which you can use a block to populate
the product card or one with a content picker to point to specific doc types of the tree.
On nested block the content picker is of the property Umb.PropertyEditorUi.ContentPicker
and when setted with a value the generated preview for the backoffice fails.

However, with a direct block and the same property type the problem isn't happening.

System.FormatException: String "[{"type": "document"" is not a valid udi.
   at Umbraco.Cms.Core.UdiParser.ParseInternal(String s, Boolean tryParse, Boolean knownTypes, Udi& udi)
   at Umbraco.Cms.Core.UdiParser.Parse(String s)
   at System.Linq.Enumerable.ArraySelectIterator`2.ToArray()
   at Umbraco.Cms.Core.PropertyEditors.ValueConverters.MultiNodeTreePickerValueConverter.ConvertSourceToIntermediate(IPublishedElement owner, IPublishedPropertyType propertyType, Object source, Boolean preview)
   at Umbraco.Cms.Core.Models.PublishedContent.PublishedPropertyType.ConvertSourceToInter(IPublishedElement owner, Object source, Boolean preview)
   at Umbraco.Cms.Core.PublishedCache.PublishedElementPropertyBase.GetInterValue()
   at Umbraco.Cms.Core.PublishedCache.PublishedElementPropertyBase.GetValue(String culture, String segment)
   at Umbraco.Extensions.PublishedPropertyExtension.Value[T](IPublishedProperty property, IPublishedValueFallback publishedValueFallback, String culture, String segment, Fallback fallback, T defaultValue)
   at Umbraco.Extensions.PublishedElementExtensions.Value[T](IPublishedElement content, IPublishedValueFallback publishedValueFallback, String alias, String culture, String segment, Fallback fallback, T defaultValue)
   at Umbraco.Cms.Web.Common.PublishedModels.SingleProductInternalPreviewBlock.get_PreviewContent() in umbraco-based-project\umbraco\models\SingleProductInternalPreviewBlock.generated.cs:line 66
   at AspNetCoreGeneratedDocument.Views_Partials_blockgrid_Components_productsPreviewBlock_productsPreviewBlock.ExecuteAsync() in umbraco-based-project\Views\Partials\blockgrid\Components\productsPreviewBlock\productsPreviewBlock.cshtml:line 48
   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(IRazorPage page, ViewContext context)
   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(IRazorPage page, ViewContext context, Boolean invokeViewStarts)
   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(ViewContext context)
   at Umbraco.Community.BlockPreview.Services.BlockPreviewService.GetMarkupFromPartial(ControllerContext controllerContext, ViewDataDictionary viewData, String contentAlias, BlockType blockType)
   at Umbraco.Community.BlockPreview.Services.BlockPreviewService.GetMarkupFromPartial(ControllerContext controllerContext, ViewDataDictionary viewData, String contentAlias, BlockType blockType)
   at Umbraco.Community.BlockPreview.Services.BlockPreviewService.GetMarkup(ControllerContext controllerContext, String contentAlias, ViewDataDictionary viewData, BlockType blockType)
   at Umbraco.Community.BlockPreview.Services.BlockPreviewService.RenderGridBlock(String blockData, IPublishedContent content, ControllerContext controllerContext, String blockEditorAlias, Guid documentTypeUnique, String contentKey, String settingsKey)
   at Umbraco.Community.BlockPreview.Controllers.BlockPreviewApiController.PreviewGridBlock(String blockData, Guid nodeKey, String blockEditorAlias, String contentElementAlias, String culture, Guid documentTypeUnique, String contentUdi, String settingsUdi)

The exception is in the UdiParser class of Umbraco that receives a bad formatted from the property value converter MultiNodeTreePickerValueConverter.ConvertSourceToIntermediate

Ps. I'm not sure is related but with contentPicker there are some older issues/74

Steps to reproduce

• Register a BlockList property on a document type
• Setup the BlockList property to add a block that itself has BlockList Property
• The nested BlockList should be configured with a block that a property of
  Umb.PropertyEditorUi.ContentPicker.

Blocks setup from document page:

• PageBlocks
  • Products Previews
    • Preview Card (to manually populate the card data)
    • Content Preview Card (content Picker to select node and autofill card from node fields)

Expected result / actual result

Indifferently from the nested level of the content picker property the preview should be generated.

[rickbutterfield]

@isIulian as with #88, I'm hoping to have a fix released for this tomorrow 🤞

[rickbutterfield]

@isIulian v3.2.0 is now on NuGet, please test and report back!

[rickbutterfield]

@isIulian as reported on #88, v3.2.1 is on NuGet now with another fix for this issue