Editing integer array cell clears data

Windows 10, pgAdmin 4.1. select version() = PostgreSQL 11.1 on
x86_64-pc-mingw64, compiled by gcc.exe (Rev5, Built by MSYS2 project)
4.9.2, 64-bit

I have a table with a column defined with integer[] data type. When
attempting to edit this using the pgAdmin GUI (double-click cell in View
Data), the content of the cell (e.g {1,2}) is cleared. When exiting the
cell, the empty cell is now rendered with the [null] text.
I was expecting to be able to edit the data directly like when double
clicking a cell defined with character varying[] data type.