I had the same bug while constructing a window inside my base and I went to the lava castle that was under my base (1500m). This is a really annoying bug because the only way to fix it is to kill yourself by thirst or hunger.
Is your base very close to the ground somewhere? Because I usually get this when I terrain almost comes poking through the floor. Somehow, my character forgets about the seabase and loves hugging the seafloor.
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