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Question

VertexCreator bug listed in FME Form 2026.3 release notes: need more details

marsol
Contributor
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Hi everyone,

I currently use FME Form 2026.2 in various large customer projects (bulk coordinate/geometry updates of GIS databases with public/municipal infrastructure), where it is critical that data quality is not degraded when processing data with FME.

I read through the release notes for FME Form 2026.3 and saw that the following bug has been added to the backlog:

VertexCreator: Point Inserted Into Incorrect Index [26550]

If I'm interpreting this correctly, this is an existing bug in VertexCreator that has been present in earlier FME versions and was only added to the known issues list with 2026.3 - ?

Due to the potentially catastrophic consequences this could have on the data quality for my customers, we would like to get more clarifications about:

  1. How the problem is triggered and if it is data-specific (maybe a particular format?) How can I detect whether this bug is affecting my conversion workflows?
  2. What workarounds are available? 
  3. Is this bug new and introduced in 2026.3? Which other FME Form versions are affected?

(Most of my workflows were built with 2022.2, but I now only have access to 2024+. )

 

Thanks, and have a nice weekend!

      2 replies

      DanAtSafe
      Safer
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      Hi ​@marsol,

      The change only affects negative index values with ‘Insert Point At Index’ mode when upgrading to version 7 of the VertexCreator in FME 2026.3.  You’ll get this warning when trying to upgrade:

       

      If the values aren’t set by an attribute, you could manually change them when upgrading to get the same result with version 7 as it was with version 6:

       

        marsol
        Contributor
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        • marsolContributor
        • Author
        • Contributor
        • October 8, 2026

        Hi Dan,

        Thank you so much for the quick follow-up and for taking the time to test this. It's a big relief that existing workspaces function as expected!

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