Disabling didn't help. And as luck would have it I received the following email today from Spotify, Warning that april 1st certain API requests will be rejected:

The "total_price_usd" field in the "Order" section has been rejected by the ordering resource of the Admin REST API.

The "origin_location" and "destination_location" fields on items have been rejected by the ordering resource of the Admin REST API.

As part of inventory management at multiple locations, a change was introduced that caused a break for the Order.line_items.fulfillment_service field. This field should be removed from both the GraphQL and REST API for the admin area. When using the GraphQL API, consider using FulfillmentOrder.assigned_location. If using the REST API, see FulfillmentOrder.assigned_location for more information.

Some customer fields were rejected by the REST API order resource in the Shopify admin area. Show change.

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Thanks for reporting, will open an issue on our github.

Can you share the link of your screenshot where they link to the changelog at the bottom "Änderungen anzeigen"?

I opened the issue here to track it. Seems the changes will be relevant with 1st April, so we have some time to prepare: https://github.com/btcpayserver/btcpayserver/issues/4650