Individual `barpolar` plots get merged into a single plot when using `subplot()`

[pedrotercero3]

Description of the issue

When I try to display any given number of barpolar plots using the subplot() function, plotly only shows one plot that has somehow aggregated all of the data from the individual plots.

Minimal reprex

Code

library(plotly)

# First barpolar plot
plot1 <- plot_ly(type = 'barpolar') %>%
  add_trace(
    r = c(10, 15, 20, 25, 30),
    theta = c("A", "B", "C", "D", "E"),
    marker = list(color = c("red", "blue", "green", "purple", "orange")),
    name = "Plot 1"
  ) %>%
  layout(title = "Barpolar Plot 1")

# Second barpolar plot
plot2 <- plot_ly(type = 'barpolar') %>%
  add_trace(
    r = c(5, 10, 15, 20, 25),
    theta = c("A", "B", "C", "D", "E"),
    marker = list(color = c("cyan", "magenta", "yellow", "gray", "pink")),
    name = "Plot 2"
  ) %>%
  layout(title = "Barpolar Plot 2")

# Combine the two plots into a subplot
subplot(plot1, plot2, nrows = 1)

Result

Expected result

Both plots shown individually, in a grid with 1 column and 2 rows.

Show session info

R version 4.4.1 (2024-06-14)
Platform: aarch64-apple-darwin20
Running under: macOS Sonoma 14.1.1

Matrix products: default
BLAS:   /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib 
LAPACK: /Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/lib/libRlapack.dylib;  LAPACK version 3.12.0

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

time zone: Europe/Madrid
tzcode source: internal

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
 [1] lubridate_1.9.3 forcats_1.0.0   stringr_1.5.1   dplyr_1.1.4    
 [5] purrr_1.0.2     readr_2.1.5     tidyr_1.3.1     tibble_3.2.1   
 [9] tidyverse_2.0.0 plotly_4.10.4   ggplot2_3.5.1  

loaded via a namespace (and not attached):
 [1] gtable_0.3.5      jsonlite_1.8.8    compiler_4.4.1    tidyselect_1.2.1 
 [5] scales_1.3.0      yaml_2.3.9        fastmap_1.2.0     R6_2.5.1         
 [9] generics_0.1.3    htmlwidgets_1.6.4 munsell_0.5.1     tzdb_0.4.0       
[13] pillar_1.9.0      rlang_1.1.4       utf8_1.2.4        stringi_1.8.4    
[17] lazyeval_0.2.2    timechange_0.3.0  viridisLite_0.4.2 cli_3.6.3        
[21] withr_3.0.0       magrittr_2.0.3    crosstalk_1.2.1   digest_0.6.36    
[25] grid_4.4.1        rstudioapi_0.16.0 hms_1.1.3         lifecycle_1.0.4  
[29] vctrs_0.6.5       glue_1.7.0        data.table_1.15.4 fansi_1.0.6      
[33] colorspace_2.1-0  httr_1.4.7        tools_4.4.1       pkgconfig_2.0.3  
[37] htmltools_0.5.8.1