Heatmap with customdata and hovertemplate doesn't display the right info, when size(customdata)=size(z)

Example of heatmap defined such that to display on hover, both the corresponding z-value and a string pointing out,
let us say, the data class or category:
```
using PlotlyJS
customdata = string.(reshape('A':'L', 4, 3))
4×3 Matrix{String}:
"A" "E" "I"
"B" "F" "J"
"C" "G" "K"
"D" "H" "L"
#with this definition we get right data displayed on hover:
pl=plot(heatmap(z = [ 9 11 12 7;
12 8 13 2;
10 13 12 5],
customdata=customdata, #note that size(customdata)=size(z')
hovertemplate="z: %{z}
Class: %{customdata[0]}"))
```
But if we pass as `customdata` the transposed matrix of the initial one, as one would expect to be normal, i.e. z and customdata have the same size, on hover we get unparsed information:
```
restyle!(pl, customdata=permutedims(customdata))
```
The same bug should be fixed for the `contour` trace, and for
`surface`, when is plotting a surface defined as a graph of function, z=f(x,y), not a parametric surface, such as sphere. etc.