An error in rendering of coastline

I have fixed the coastline of Cửa Lò Township in Vietnam, but this occurred:

Can a person fix this?
Thank you,
Tuấn.

HI and welcome to OSM and the forum

Please note that coastline rendering is diffrent from rendernig normal features: https://wiki.openstreetmap.org/wiki/Coastline#Rendering_in_Standard_tile_layer_on_openstreetmap.org

Also see https://www.reddit.com/r/openstreetmap/comments/v7rzrg/an_error_in_rendering_coastline/