Forge app cannot go in sandbox after paid subscription


I have a customer who has a paid version of my Forge app.

Following a major upgrade of my app, he would like to test this new version in his organization sandbox to minimize risks and friction points before updating the app in production.

Unfortunately, my customer is unable to install my Forge app in a sandbox. It appears that a Forge app cannot go into a sandbox after a license has been bought.

We found this bug on Atlassian stating this is not possible with a Forge app. The bug is relatively new and has been updated for the last time in April 2024.

If you encountered this issue, have you found a workaround?

Thank you for your help,