Strange artefacts on landscape

Buggane
Thu, 23 May 2024 13:40:27 +0000
World Creation

Using 5.3 with Lumens and was happily editing the landscape when I started to get these strange artefacts on the landscape (top image). If I go into landscape mode and make a slight adjustment, such as smoothing and then come out of landscaping then they go away and looks like it should (bottom image). If I save and close however they come back when I reopen. Any ideas pleas as it is beyond my knowledge.

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