CSV export does not provide “Custom Field” data for larger exports

[Meuschke23]

Hello dear FreeScout team,
First of all, thank you for the great software.
I use FreeScout as a Docker container (tiredofit/freescout:latest) on a Ubuntu Server 22.04 LTS

I put the “Export Conversations” module into operation yesterday:

and noticed that with larger amounts of data (full export) the data from "Custom Fields"
are not transferred to the CSV file.

This works perfectly with smaller amounts of data. See the attached screenshots:
full export:

small export:

Do you have any idea why this might be?

PHP version: latest docker
FreeScout version: latest docker
Database: MySQL
Are you using CloudFlare: No
Are you using non-official modules: No

Best regards

Meuschke