Save failed with the following error: Invalid parent ID.

Hello,

Since I re-created my website (switched to Joomla 6) I get the following error: "Save failed with the following error: Invalid parent ID." while saving a form field. I've made an export from the old, Joomla 5, site. Installed the VISforms and Subscription and did an import, which was successful. Strangest thing is that, despite the error, the changes are saved.
V1: Visforms Version 6.2.1, Subscription Version 6.2.1
V2: Joomla 6.1.4
V3: PHP 8.3.8

Hello Jeroen,

Thanks for providing the exact error message.

The simplest, fastest, and most promising approach for everyone involved is as follows:
Could you provide us with an Akeeba backup of the website for debugging purposes?
We use the following platform for this: wetransfer.com/
Please use the forum email address as the recipient: forum (--at--) vi-solutions.de.

Please also include a detailed description of how to reproduce the error, the fields involved, and details regarding which form is used and how it is accessed.

Note:
The Akeeba backup can be kept very small, provided it still reproduces the error.

Kind regards, Ingmar