trr ggplot theme: hex-colors differ when entered without #

[arndtupb]

I recognized that some of our theme-colors (i) are recognized by ggplot as color when they are entered without a # in the color option but (ii) then do not print the respective color. Reproducible example:

if (!require(ggplot2)) {install.packages("ggplot2")}   
library(ggplot2)

source("https://raw.githubusercontent.com/trr266/treat/main/code/R/theme_trr.R")

ggplot(data=data.frame(x = 0:5, y = 5)) +
  geom_hline(yintercept = 5, color = "#224B4F", linetype = "dotted") +
  geom_hline(yintercept = 4, color = "#224b4f", linetype = "dashed") +
  geom_hline(yintercept = 3, color = col_trr266_darkgreen, linetype = "longdash") +
  geom_hline(yintercept = 2, color = "224b4f", linetype = "solid") +
  ylim(1.5, 5.5) + 
  theme_trr()

The solid line at yintercept = 2 will be colored in a light grey & not in dark green as the other 3 horizontal lines. Meanwhile, ffb43b (col_trr266_yellow) throws an error Unknown colour name: ffb43b when entered without the #. Should we mark this aspect at some point in our documentation?