Please, read the OSM wiki about natural=coastline. It has a very strict use-case.

Please, read the OSM wiki about natural=coastline tag. It is incorrect to use it in the way you did in this changeset.

Revert this changeset because natural=coastlines are broken.

Please, read OSM wiki about coastlines and use JOSM editor + Validator where they are affected.

New coastline way/1449436936 duplicates the existing one way/1447932542

IDK, what should remain here (different roles in Relation).

You change breaks coastlines. Please, read Wiki about natural=coastline tag. Fixed here changeset/174265883

Your changeset is not good:
- Please, read the OSM Wiki about tags. natural=coastline is not suitable here
- Add type defining tags if the point ("Localita mercury") means something (hotel, shop, amenity, etc)

Отлично! Я пока удалил natural=coastline. Вкратце, он предназначен для материк - море/океан.

No problem, I've already fixed.

natural=coastline специфический тег, пожалуйста, прочитайте wiki, прежде чем его назначать.

Coastlines are broken with this change ..

Coastlines are broken after this changeset.

Coastlines are broken after this changeset.

More "ucap"
way/483856021
way/483856041

If you changed "Doctor Avul Pakir ..." name, then you should also correct nearby addresses with addr:street tags and also fix nearby sreets.

But I suppose that OSM is used to tag full street names instead of "A.P.J"

Coastlines are broken.
way/1324630684 is not connected.

Ok, will fix it. I was testing a new editor in OM.

Coastlines are broken after this change. Please, check way/25865383

Coastlines are broken after this change. Please, use JOSM and validator when editing coastlines.

Why coastline?

Why "beach" here?