Creating a board from a template breaks subtasks

[Xilef11]

Issue

Server Setup Information

• Did you test in newest Wekan?: No, Version 6.17.0 and this was not mentioned in issues/commits since that version
• Did you configure root-url correctly so Wekan cards open correctly (see https://github.com/wekan/wekan/wiki/Settings)? Yes
• Operating System: Windows
• Deployment Method (Snap/Docker/Sandstorm/bundle/source): Docker
• Http frontend if any (Caddy, Nginx, Apache, see config examples from Wekan GitHub wiki first):
• Node.js Version: 14.19.1
• MongoDB Version: 4.4.13
• What webbrowser version are you using (Wekan should work on all modern browsers that support Javascript)?: Firefox 99.0.1

Problem description

Reproduction Steps

1. Create a board template (with subtasks set to be dropped in the same board)
2. Create a new board from the template
3. Change the new board's settings to select subtask drop location
4. Create a task in the board from step 2
5. Create a subtask for the task from step 4

The card for the subtask gets dropped in the template board, and clicking on it (from the template board) links back to the parent task in the normal board.

Changing the settings of the board does not change this behaviour. Deleting the subtasks from the template does not delete them from the cards in the actual board.

Logs

The commands listed in the issue template don't produce meaningful output and I don't know what files/logs from the container would be useful in debugging this.