R ggplot2 rmd returning an empty html - r

Question

Based on the code and data below, the rmd knitted fine initially with the code and output (default option), but then I just changed the chunk option to show output only. And, since then I am getting an empty html. I tried reverting back to default, I even cleared the environment and restarted RStudio, but it does not fix it.
What could be causing the issue?
Code + data:
---
title: "Gantt Chart"
author: "Ed"
date: "2022-08-12"
output: html_document
editor_options:
chunk_output_type: console
---
```{r setup, include=FALSE}
knitr::opts_chunk$set(include = FALSE)
library(tidyverse)
library(plotly)
```
```{r Gantt Chart, echo=FALSE}
df = data.frame(task=c("Explore Ideas", "Finalize Idea", "Make Plots with\n geom_line", "Make Plots with\n Plan Package", "Add Writeups", "Refine Plots", "Review Tutorial", "Submit Tutorial", "Get Feedback\n and Update"),
start=c("2019-10-15", "2019-10-18", "2019-10-19", "2019-10-22", "2019-10-24", "2019-10-25", "2019-10-26", "2019-10-27", "2019-10-28"),
end=c("2019-10-18", "2019-10-19", "2019-10-24", "2019-10-26", "2019-10-27", "2019-10-27", "2019-10-28", "2019-10-28", "2019-10-31"),
owner=c("Harish", "Phani", "Harish", "Phani", "Phani", "Harish", "Phani", "Harish", "Phani"))
head(df)
df = df %>%
mutate(start = as.Date(start), end = as.Date(end))
df_tidy = df %>%
gather(key=date_type, value=date, -task, -owner)
gantt_plot = ggplot() +
geom_line(data=df_tidy, mapping=aes(x=fct_rev(fct_inorder(task)), y=date, color=owner), size=10) +
geom_hline(yintercept=as.Date("2019-10-27"), colour="black", linetype="dashed") +
coord_flip() +
scale_y_date(date_breaks = "1 day") +
labs(title="Community Contribution Gantt Chart",
x = "Task",
y = "Date",
colour = "Owner") +
theme_bw() +
theme(axis.text.x = element_text(angle = 90),
panel.grid.minor = element_line(colour="white", size=0.5),
legend.position="right",
plot.title = element_text(hjust = 0.5))
ggplotly(gantt_plot)
```