Error adding rows to data table

Have a simple two item chart and when I try to add rows to the data table the columns expand. Display the data table and try to move the cursor to the bottom so that I can add a row and as soon as I go to the second row two empty columns are added. When I get to the bottom the screen fills with empty columns.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: libreoffice-impress 1:6.4.0-0ubuntu4
ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18
Uname: Linux 5.4.0-14-generic x86_64
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Feb 18 12:01:31 2020
InstallationDate: Installed on 2019-11-12 (98 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20191112)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: libreoffice
UpgradeStatus: No upgrade log present (probably fresh install)