...ahh yes, the Grid Tool...I've worked around this in the past by creating the Grid System in a New instance of AC and merging the grid into the Project File. I keep this "Grid file" in case any grid elements need to be modified (which is when they seem to loose their settings).
MacBook Pro Apple M2 Max, 96 GB of RAM
AC27 US (5003) on Mac OS Ventura 13.6.2
Started on AC4.0 in 91/92/93; full-time user since AC8.1 in 2004