pgAdmin4 can't re-attach some previously detached partition

Hello,

I recognized that for some reasons pgAdmin4 does not allow to re-attach
some of the previously detached partitions:

Here is the test script to reproduce:

create table test (id integer, col1 integer, col2 integer) partition by
list (id);

create table test1 partition of test for values in (1);

alter table test drop column col2;  

create table test2 partition of test for values in (2);

alter table test detach partition test1;

alter table test detach partition test2;

pgAdmin4 allows to attach back test1 but not test2!  Both tables can be
re-attached with alter table command without any problems.

I'm on pgAdmin 4.2 on Centos7 and Fedora 29