Hello, I use Jevents for an J3.10 Installation. Importing ICS-Files with multiple Categories

[...]
CREATED:20211202T180103
CATEGORIES: Kindergarden, Southside
DESCRIPTION:in der ev. Kirche an der Wilhelminenstrasse\n
DTEND:20211219T121500
[...]

In J3 I can import the file and found in event the two categories (see first attachement)

Importing ICS File in J4 there is a Category-Field available, too. But there is ony one category selected and no multiple selection of
categories is possible or automatically saved. This reduced the functionality for me in a strong way. Is it a bug?