Public app with legacy installation flow stopped working for new shops

Hello,

One of our public apps is using legacy installation flow and we have use_legacy_install_flow = true in our app configuration.
Our app stopped working for new shops from last Friday and we are getting support request from new shops that they can’t install our app.
The app keeps showing this screen.

Existing shops don’t have any issues.

We already started upgrading our app to Shopify managed installation.
But we would like to fix current issue until we complete the migration.

Any thoughts?

Thank you,

Remy