save.image() output corrupt

Hi there,
I have started getting the following message when I source saved outputs (the line number changes).

Error in source("filename.RData") :
invalid multibyte character in parser at line 10

It is happening with every saved environment object whether large model outputs or just csv data manipulation type stuff. I am not really sure when it started happening, it's just becoming more obvious because I need it more often at the moment but can never use it. The only thing I can find online relates to ideogram languages, but all my scripts are in English.

platform aarch64-apple-darwin20
arch aarch64
os darwin20
system aarch64, darwin20
status
major 4
minor 2.1
year 2022
month 06
day 23
svn rev 82513
language R
version.string R version 4.2.1 (2022-06-23)
nickname Funny-Looking Kid

R studio Version 2023.12.1+402 (2023.12.1+402)

Any advice would be great! thanks!