I have been there in March 2022, and even heavier climbers than me climbed on the block, but we didn't notice any movement. Only there was a sound of two big trees knocking when moving against each other in the wind...
Rain sucks, but broken holds suck even more. Remember, never climb on wet rock in Fontainebleau.
The sandstone becomes brittle, and pulling on it will ruin classic problems. Drying it doesn't help, because it's still wet and weak inside.
All you can do is wait for better conditions.