I can't reproduce this issue while running your code
---
title: "Untitled"
output: html_document
date: '2022-06-05'
---
```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
library(reticulate)
```
```{python}
import seaborn as sns
# Load an example dataset
tips = sns.load_dataset("tips")
# class is a pandas.core.frame.DataFrame
print(type(tips))
```
```{r}
# access with py$variable_name
tips <- py$tips
# class is a R data.frame
class(tips)
```
BTW I reformated your post - see FAQ: How to Format R Markdown Source