piling isoforms broken in pkgdown examples about gggenomes HOT 1 CLOSED

R version 4.0.3 (2020-10-10)
Platform: x86_64-conda-linux-gnu (64-bit)
Running under: Ubuntu 18.04.5 LTS

Matrix products: default
BLAS/LAPACK: /home/jovyan/.conda/envs/gggenomes/lib/libopenblasp-r0.3.12.so

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

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

other attached packages:
 [1] gggenomes_0.0.0.9000 jsonlite_1.7.2       tibble_3.0.6        
 [4] thacklr_0.0.0.9000   stringr_1.4.0        readr_1.4.0         
 [7] purrr_0.3.4          gggenes_0.4.1        ggplot2_3.3.3       
[10] dplyr_1.0.3         

loaded via a namespace (and not attached):
 [1] pillar_1.4.7      compiler_4.0.3    tools_4.0.3       ggfittext_0.9.1  
 [5] digest_0.6.27     evaluate_0.14     memoise_2.0.0     lifecycle_0.2.0  
 [9] gtable_0.3.0      pkgconfig_2.0.3   rlang_0.4.10      DBI_1.1.1        
[13] rstudioapi_0.13   yaml_2.2.1        pkgdown_1.6.1     xfun_0.20        
[17] fastmap_1.1.0     withr_2.4.1       knitr_1.31        hms_1.0.0        
[21] desc_1.2.0        generics_0.1.0    fs_1.5.0          vctrs_0.3.6      
[25] rprojroot_2.0.2   grid_4.0.3        tidyselect_1.1.0  glue_1.4.2       
[29] R6_2.5.0          processx_3.4.5    rmarkdown_2.6     tidyr_1.1.2      
[33] callr_3.5.1       magrittr_2.0.1    rematch2_2.1.2    scales_1.1.1     
[37] ps_1.5.0          ellipsis_0.3.1    htmltools_0.5.1.1 assertthat_0.2.1 
[41] colorspace_2.0-0  stringi_1.5.3     munsell_0.5.0     cachem_1.0.1     
[45] crayon_1.4.0