DISTRIBUTED CACHE IS NOT UPDATED - Could not create an instance of type Umbraco.Forms.Core.Interfaces.IWorkflow

[PerplexDaniel]

This is a new variant of #687 where the Distributed cache crashes again but this time with a different exception:

Could not create an instance of type Umbraco.Forms.Core.Interfaces.IWorkflow.
Type is an interface or abstract class and cannot be instantiated.
Path '[0].Workflow.id'

Full stack trace available in Specifics.

I see this in version 9.2.1 which fixed another Distributed Cache exception (#687).

Specifics

Full stack trace (except actual JSON data of our forms):

[09:19:26 ERR] DISTRIBUTED CACHE IS NOT UPDATED. Failed to execute instructions (147: '<JSON_BLOB>'). Instruction is being skipped/ignored
Newtonsoft.Json.JsonSerializationException: Could not create an instance of type Umbraco.Forms.Core.Interfaces.IWorkflow. Type is an interface or abstract class and cannot be instantiated. Path '[0].Workflow.id', line 1, position 19.
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateNewObject(JsonReader reader, JsonObjectContract objectContract, JsonProperty containerMember, JsonProperty containerProperty, String id, Boolean& createdFromNonDefaultCreator)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetPropertyValue(JsonProperty property, JsonConverter propertyConverter, JsonContainerContract containerContract, JsonProperty containerProperty, JsonReader reader, Object target)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(Object newObject, JsonReader reader, JsonObjectContract contract, JsonProperty member, String id)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateList(IList list, JsonReader reader, JsonArrayContract contract, JsonProperty containerProperty, String id)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateList(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue, String id)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
   at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
   at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings)
   at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value, JsonSerializerSettings settings)
   at Umbraco.Cms.Core.Cache.PayloadCacheRefresherBase`2.Refresh(String json)
   at Umbraco.Forms.Core.Cache.WorkflowCacheRefresher.Refresh(String jsonPayload)
   at Umbraco.Cms.Core.Services.Implement.CacheInstructionService.NotifyRefreshers(CacheRefresherCollection cacheRefreshers, IEnumerable`1 instructions, HashSet`1 processed, CancellationToken cancellationToken)
   at Umbraco.Cms.Core.Services.Implement.CacheInstructionService.ProcessDatabaseInstructions(CacheRefresherCollection cacheRefreshers, IReadOnlyCollection`1 instructionBatch, CacheInstruction instruction, HashSet`1 processed, CancellationToken cancellationToken, Int32& lastId)
[09:19:26 INF] The current batch of instructions was not processed, app is shutting down

Steps to reproduce

It seems to crash on deserializing workflows so presumably to reproduce it's simply this:

1. Create a Form with a Workflow.
2. Save your form.

Expected result

Distributed cache is updated without problems.

Actual result

Distributed cache throws an exception

[AndyButland]

Thanks - can replicate and we've found a fix for this, to be released in the next patch update.