ggtext and parsing html with latest version of ggplot

I found a problem with ggplot and rendering html text with ggtext or marquee

I expected to parse character string in html format and have the style implemented.
This works for my code in ggplot 3.5.2 but not in ggplot 4.0.0

Here is the code to reproduce the bug:

library(ggplot2)
library(ggtext)

# Minimal dataframe
df <- data.frame(
  gRNA_type = rep(c("cd<sup><i>g338-384</i></sup>", 
                    "wt<sup><i>control</i></sup>"), each = 5),
  win = c(95, 88, 92, 90, 94, 45, 50, 48, 52, 47),
  loss = c(5, 12, 8, 10, 6, 55, 50, 52, 48, 53),
  id = 1:10
)

# Test plot
ggplot(df, aes(x = gRNA_type, y = win)) +
  geom_point() +
  theme_minimal() +
  theme(axis.text.x = element_markdown())

^{Created on 2025-11-19 with reprex v2.1.1}

Start by running the provided R reproduction with ggplot2, ggtext, and element_markdown(), then compare the behavior between ggplot2 3.5.2 and 4.0.0. No repository file or test is named in the issue; done means the HTML styling renders correctly in the affected ggplot2 version.