Groups are no longer visible in contacts list

[DA4PKol]

Hi,

Since the upgrade from roundcubemail 1.4.3 to 1.5.3 (with Kolab 16 under Debian 10 and Ubuntu 18), groups are not visible anymore in the list of address books, when they were listed under the address book's names in the previous version.
When viewing a contact, the groups it belongs to before show up. But for a new user, nothing is displayed.
It's possible to create a new group, that shows up where it have to, but leaving the Address Books panel for the Calendar's one make it disappear.
Is it the normal behavior ?

Config 1 :

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Debian 10 buster / Kolab 16.0.1-22 / Roundcubemail 1:1.5.3-0~kolab2
Config 2 * :

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Ubuntu 18.04.6 LTS / Kolab 16.0.1-22 / Roundcubemail 1:1.5.3-0~kolab2 ( * just installed kolab for test : no tweak, out-of-the-box).

DA4PKol (please, excuse my poor english!)