When retrieving content via api we get the wrong data in blocklists. Only on some pages. Some pages consistently returns the right data and some consistently returns the wrong data.

If we look at the page rendered in an Umbraco view - content is rendered correct.

This works in the view:

@inherits Umbraco.Web.Mvc.UmbracoViewPage<ContentModels.Page>
@using ContentModels = Umbraco.Web.PublishedModels;
@{
    Layout = "master.cshtml";
}

@Html.GetBlockListHtml(Model, "blocks")

Here are some examples that doesnt work

Example 1 : The umbracoapicontroller

In the controller we get data like this:

public IHttpActionResult Get(int id, int levels = 1)
        {

           IPublishedContent content = UmbracoContext.Content.GetById(id);

Example 2 : The umbracoapicontroller and umbracohelper

In the controller we get data like this:

public IHttpActionResult Get(int id, int levels = 1)
        {

           IPublishedContent content = Umbraco.Content(id);

*Example 3: The Umbraco Surface controller *

  [HttpGet]
    public JsonResult Get(int id = 1090, int levels = 1)
    {

        var content = UmbracoContext.Content.GetById(id);

Same difference in all 3 examples. If I debug and inspect content I can find examples where one or more of the blocks in the block list is wrong.

I can fix the problem

A few things tried:

• If the editor, in Umbraco updates the block - the problem remains the same.

• If the editor, in Umbraco sorts / moves the block - the problem remains the same.

• If the editor copies the block and insert a new copy - the problem is fixed

Some facts

Problem was first spotted on a solution running on an Umbraco.sdf. We've tested migrating to sqlexpress. Problem still there.

Discovered in Umb 8.14.1. Upgraded to latest 8.18.4. Problem still there.