ggplotly breaks custom, log transformed, axis labels

Unfortunately this does not show an error, only a warning. A better behavior would probably be returning an error when passing an expression.

See below for an example where the x axis has been log transformed.

plot_gg = ggplot(iris,aes(Sepal.Length,Sepal.Width,col=Species))+
    geom_point()+ 
    scale_x_continuous(trans = scales::log2_trans(),
                       breaks = scales::trans_breaks("log2", function(x) 2^x),
                       labels = scales::trans_format("log2", scales::math_format(2^.x)))
plot_gg

plot_ly=plotly::ggplotly(plot_gg)
plot_ly

Warning message:
In is.na(ticktext) :
  is.na() applied to non-(list or vector) of type 'expression'

Start by running the R example in the issue and compare the ggplot2 output with the ggplotly output and warning. Trace how ggplotly handles transformed axis breaks and expression-valued labels; done means the behavior is intentional and covered by a regression check, either by handling the labels correctly or reporting the unsupported expression clearly.