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JSON deserialize exception when importing migrated Blocklist data over legacy Nested Content #632

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@BarryFogarty

I am migrating legacy v8 Nested Content to BlockList v13. Datatypes import fine, however the following error is generated when importing content:

Error: Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'Umbraco.Cms.Core.Models.Blocks.BlockValue' because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly. To fix this error either change the JSON to a JSON object (e.g. {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (e.g. ICollection, IList) like List<T> that can be deserialized from a JSON array. JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array. Path '', line 1, position 1.

Interestingly this only seems to affect unpublished content items. It seems to be a reasonably recent regression as importing the same files to a v12.3.9 (with uSync 12.2.3) is not affected.

NB I am importing on top of an existing database, in order to maintain user permission config. I will try on a fresh DB but I believe it is not affected by this issue. Perhaps uSync is first attempting to deserialize the Nested Content data held in the blocklist property in this context, rather than simply overwriting it.

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