Remove lines from inside a polygon in QGIS

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Through a "dissolve" process in QGIS, I achieved some polygons that have some fails, like this one in the screeshot:

Is there any automatic process I can make in QGIS to remove those lines inside the polygon and leave only the outer borders? I can manually delete using the Node Tool, but I was looking for an automated solution.

The polygon seems to be closed, as it can be seen:

thanks in advance!



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