result editing to insert rows has a bug with having NOT NULL column

CREATE TABLE "cub_uv"(
"reg_date" date NOT NULL,
"global_uv" integer NOT NULL,
"korea_uv" integer NOT NULL,
CONSTRAINT pk_cub_uv_reg_date PRIMARY KEY("reg_date")
);

1)
I tried:
in the qeury result pane,
20 empty rows added -> only 15 rows has values -> commit button click -> error popped up that NULL value is not allowed -> I deleted those empty rows(5 rows) -> commit button click --> the same error popped up that NULL value is not allowed. However I already deleted those empty rows.

It seems a bug

2)
so I tried
15 rows copy with Ctrl + C -> doesn't work. I have to use mouse right button to them.

Please let us use Ctrl + C short keys in the result edit pane. and Tab key too. and Arror key too to move over cells.

3)
so I tried
select 15 rows + generating INSERT statements into the clipboard

Please display any popped up "Copied to the Clipboard, Please paste on your editor"
The user cannot notice if they are copied successfully or not.