Can not select existing talk conversation. Error applying conversation to event

[SergeyMosin]

Steps to reproduce

1. Start creating a new event
2. Click Add Talk conversation button
3. Select an existing conversation (adding new once works)
4. 🐛 💥

Expected behavior

New conversation is added to the event.

Actual behavior

Error applying conversation to event

Calendar app version

6.6.1

CalDAV-clients used

No response

Browser

Firefox

Client operating system

Ubuntu

Server operating system

Ubuntu

Web server

Apache

Database engine version

MariaDB

PHP engine version

PHP 8.3

Nextcloud version

33.0.9

Updated from an older installed version or fresh install

None

List of activated apps

Nextcloud configuration

Web server error log

Log file

Browser log

[ERROR] calendar: Error applying conversation to event: 
Object { app: "calendar", uid: "admin", level: 2, error: TypeError }
​
app: "calendar"
​
error: TypeError: can't access property "changeLocation", this.calendarObjectInstanceStore is undefined
​
level: 2
​
uid: "admin"
​
<prototype>: Object { … }
calendar-main.js:56:374

Additional info

No response