DH removes roofs of 1 block size from buildings

I generated a DH map of my world while standing still. Everything is successful, all the houses are detailed and they have a roof. But when I start flying over the city, DH removes the roofs of the houses next to me, and the removed roofs remain removed and are not restored at a distance. This only happens with roofs that are 1 block thick. Where I put the second layer of blocks, the roof returned and did not disappear. Is there any setting to fix this?
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Solution
Thank you. "Recalculate Chunk Heightmap = True" solved the problem. The roofs are slowly recovering, even near me. But it seems that the load on the computer has become higher
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