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Very poor performance on a specific Landscape area

Hey all,
In the highlighted area of the landscape I get a very very very poor performance. From 120fps down to 5. When trying to edit it, It’s also super, super slow, compared to the all the other areas of the landscape. There is nothing specific tied to that area, it’s just a normal landscape.

Initially it had height data (it looked like what you see all around it), but i deleted it, trying to eliminate the cause of that issue. I also deleted (and then re-added) the components from that area, with no change.

It’s not a GPU issue for sure. It’s not something directly related to a player pawn or anything for sure also.
When trying to sculpt said area, it freezes for a few seconds. This is not the issue in other areas.

Could it be a bug ? Is there a fix to this ?