Error 500 when creating a new dataset using a default template with Custom Terms (Docker - 6.11)

What steps does it take to reproduce the issue?

I ran a new clean instance of dataverse 6.11 using the official docker images. I used two different images and the bug was the same in both:
6.11-noble-r4
6.11-noble

I used the docker compose given as example to make sure none of my custom bootstrap configurations were breaking the instance.

• When does this issue occur?

1. Create a New Dataverse Template
2. In the template "Terms", select "Custom Dataset Terms"
3. Mark Template as "Default"
4. Go to "New Dataset"

• Which page(s) does it occurs on?

New Dataset page

• What happens?

When going to "New Dataset", an error page pops up with an error 500 Internal Server Error - An unexpected error was encountered, no more information is available.

• To whom does it occur (all users, curators, superusers)?

All users

• What did you expect to happen?

To be able to create a new Dataset with a default template with custom terms.

Which version of Dataverse are you using?
6.11

Any related open or closed issues to this bug report?
No

Screenshots:
Default template:

Default template has "Custom terms":

When going to create a new Dataset:

The 500 error occurs:

As a side note, if I leave the template as non-default, I am able to select the template from the creation page and successfully create the dataset:

Are you thinking about creating a pull request for this issue?
Help is always welcome, is this bug something you or your organization plan to fix?

Reproduce with the 6.11-noble Docker image and the documented docker compose quickstart: create a default template with Custom Dataset Terms, then open the New Dataset page. Compare this with selecting the same non-default template; done means the default-template flow opens without an HTTP 500 and permits dataset creation.