Libreoffice Writer - Export to PDF creates always a thin hairline for Tables

Hi There, I have a problem with my export to PDF. I created in Libreoffice Writer a simple table with no border and filled the table cell with a dark color. In the print preview everything looks ok, but when I export to PDF then the table has a thin hairline. I checked the table properties but I have not set any border. Looks to me to be a bug?

Any ideas?

LibreOffice Version
Ubuntu 22.04

Can’t reproduce from your description. Then, edit your question to attach your file for analysis.

Maybe this answer by @ajlittoz to a similar question has relevance to your situation, Grid lines showing in PDF - #4 by ajlittoz

Table background might be a better bet than cell background.

Thank you very much, this solved my problem.