BotUI: Multiselect doesn't save values

Using the latest ZP version 5.15.0.0 and just tried to add BotUI with type "multiselect" to an existing project, but no matter what value(s) I choose in the multiselect it is not saved and forwarded to the appropriate project's variables. Even if I open the BotUI next to the project in ZP and e.g. select item1 and item3 and close it with ok, nothing is selected in the multiselect object when I re-open it immediately.
Set up an project with just 1 variable, an alert that outputs the value of the variable and added the BotUI with one multiselect. Same there.

Btw, what does the "Selected options" in properties of the multiselect mean?

Thank you.

Am I the only one with this problem or does the BotUI mulitselect type not work as it should in general?

Thank you for letting me know. When do you think will the next version be released? Because I have a customer who urgently needs a project finalized and there I would need the fix for it.