R Shiny DT package won't save edited values if I set to disable some columns to be editable mode

[sound118]

I want to use the r shiny code on https://www.r-bloggers.com/2019/04/edit-datatables-in-r-shiny-app/ as an example to regenerate the issue I am facing. Basically if I change
output$mod_table <- DT::renderDataTable({
DT::datatable(v$data, editable = TRUE)
})

to be like below
output$mod_table <- DT::renderDataTable({
DT::datatable(v$data, editable = list(target = 'column', disable = list(columns = 1:2)), rownames = FALSE)
})

observeEvent(input$saveBtn, {
write.csv(df0, "/home/rstudio/Data Dictionary/BA_filled_data.csv", row.names = FALSE)
})

This only allows user to edit other columns except column 1 and 2. However, when I try to save the edited data into a csv file to a certain directory, I cannot see the update data in there while I can see the update data if I use editable = TRUE.
Is this a bug in DT package, or I get something wrong?

Can someone pls help with this issue? Thanks!

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[stla]

Do you use the proxy?