As mentioned in another post, I'm currently upgrading a bunch of workbenches to run on FME Flow 2024, some of them many years old. Typically, for anupgrade, I will go through each workbench, upgrade all transformers, readers, and writers, then run it in test desktop (workbench) environment, then publish to and test in a test server (flow) environment.
In, FME 2024 the Vertex Extractor gives me bogus results, even after upgrading all the constituent transformers in this custom transformer. It looks like X and Y, or Lat and Lon, are reversed.

When I open the CoordinateConcatenator (arrow above), I see this:

While I haven’t dug through the rest of the custom transformer, this - frankly - looks counter-intuitive.
When I change that to “XYZ”, everything runs just fine and results are as expected.

I have tried to compare my version (I’m assuming that upgrading all components makes it uptodate) to older versions to see whether upgrading might have introduced this problem but I see the same from the screenshot in older version of the Vertex Extractor.
Has anyone come across this? I’m using 3D data for this. Never had an issue before. But I also don’t remember that I have tried to upgrade the components inside this particular custom transformer before. So it’s possible I have carried over an ancient version through a number of upgrades. Never noticed any adverse consequences though.