B1087, the Falcon Heavy centre core for the GOES-U mission, performs a static fire at McGregor.

Video: https://x.com/AdamCuker/status/1765947053169942992#m

Photo and more info:

This explains why B1087 was taken out from the Falcon booster stand at McGregor after what appeared to be two aborted attempts at a static fire test last month.

https://blogs.nasa.gov/goes/2024/02/27/launch-of-noaa-weather-satellite-delayed/

NASA and SpaceX are now targeting no earlier than May 2024 for the launch of the fourth and final satellite in NOAA’s Geostationary Operational Environmental Satellites (GOES) – R Series, GOES-U. The new date allows for additional testing and preparation of a new Falcon Heavy center core booster after a liquid oxygen leak was discovered during routine new booster testing.