Procedural rocks popping on and off seemingly randomly [4-26]

Hi

Sorry if this is the wrong place to post this but I am using procedural rocks (Joe Garth’s brushify.io landscape material) and every time you animate the camera in sequencer the procedural rocks on the slopes disappear and reappear. I have tried to contact brushify but didn’t hear back so wondered if anyone has experienced this before and can recommend a solution? I thought it might be the distance tiling but I’ve tried changing all the settings to no avail…

Wondered if it might be a standard complaint relating to landscape materials with procedural meshes…

Thanks in advance!

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