I recently updated to R version 4.4.0, which I’m using through RStudio (2024.04.0+735). ggplot2 won’t let me add a palette anymore and I’m going crazy.

Where is this ghost palette coming from? How can I get rid of the error?

In a fresh session with no attached packages, the following code produces an error:

ggplot2::ggplot() + ggplot2::scale_color_manual(palette = function(n) n)

The error reads:

Error in discrete_scale(aesthetic, name = name, palette = pal, breaks = breaks, :
formal argument “palette” matched by multiple actual arguments

Session info:

R version 4.4.0 (2024-04-24)
Platform: aarch64-apple-darwin20
Running under: macOS Sonoma 14.0

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: Asia/Jerusalem
tzcode source: internal

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

loaded via a namespace (and not attached):
 [1] utf8_1.2.4        R6_2.5.1          tidyselect_1.2.1  magrittr_2.0.3   
 [5] gtable_0.3.5      glue_1.7.0        tibble_3.2.1      pkgconfig_2.0.3  
 [9] generics_0.1.3    dplyr_1.1.4       lifecycle_1.0.4   ggplot2_3.5.1    
[13] cli_3.6.2         fansi_1.0.6       scales_1.3.0      grid_4.4.0       
[17] vctrs_0.6.5       compiler_4.4.0    rstudioapi_0.16.0 tools_4.4.0      
[21] munsell_0.5.1     pillar_1.9.0      colorspace_2.1-0  rlang_1.1.3