Use extendTraces with contour in x dimension

I have a contour plot that shows water temperature at various depths over time. So “depth” on the y-axis, “time” on the x-axis, and “temperature” as the z-axis (color). The “y” axis does not change because it is always the same depths that I have temperatures for. As time goes forward I get new data points for each depth; so new data points added on the x-axis.

I’m using “extendTraces” to try to do this by specifying new “z” data, but it seems like there is no way to extend the data in the “x” dimension, only the “y” dimension. Is there a way to do this that I am just missing? Any ideas for a workaround?

That sounds like a bug. Could you share a reproducible example with us to help us debug? Thanks!

This is the best I could come up with:

So every “z” value specified in “extendTraces” is treated as a new “row” to add to the “z” dimension. I would like to add a new “column”.

Edit: It makes sense why this works this way, but I’m still not sure what I’m missing to do it in the x direction.

Any updates or other ideas on this?