Open the file and save it directly without making any changes. The line breaks of all cells are modified.

[H0LIXI]

EPPlus usage

Noncommercial use

Environment

Windows10

Epplus version

7.1.x

Spreadsheet application

Excel

Description

I used EPPlus to open Excel, modified some cells, and then saved.
After saving, I found that other cells that I did not modify were also changed.
And I found that all the changes were line breaks.

I have provided a test project, which contains a TestFile.xlsx.
After running in the project, TestFile-1.xlsx will be copied and saved using the Epp plug-in.
After running, you can use BeyondCompare to compare and view
TestEPPlusLineSymbol.zip

My BeyondCompare result like this.

[JanKallman]

When you have \r\n as line break, it seems to be replaced by two \n\n. I will investigate some more and provide a fix.