Missing thumbnail urls for album, artist and track

[VeraAngerer]

Plan

Free/Premium

Country

Austria

My Question or Issue

We're using the oembed API of yours to retrieve embed data for various types. Since yesterday, we don't seem to receive the "thumbnail_url" parameter anymore for album, artist and track embed types. Have there been changes for these responses or was there an accidental removal of this field?
How can we now retrieve the thumbnail urls for these embed types?

E.g. for this item: https://open.spotify.com/track/3hCmhLLqJXxRmN7OUrXmr1?si=1f6c048854d8403b&nd=1&dlsi=cfd6785c9f1a44df

we get the following response which does not include the thumbnail_url property anymore.

response": {
"data": {
"html": "<iframe style=\"border-radius: 12px\" width=\"100%\" height=\"152\" title=\"Spotify Embed: Sky\" frameborder=\"0\" allowfullscreen allow=\"autoplay; clipboard-write; encrypted-media; fullscreen; picture-in-picture\" loading=\"lazy\" src=\"https://open.spotify.com/embed/track/3hCmhLLqJXxRmN7OUrXmr1?si=1f6c048854d8403b%3Fsi%3D657b29dc8a4b4..."></iframe>",
"iframe_url": "https://open.spotify.com/embed/track/3hCmhLLqJXxRmN7OUrXmr1?si=1f6c048854d8403b%3Fsi%3D657b29dc8a4b4...",
"width": 456,
"height": 152,
"version": "1.0",
"provider_name": "Spotify",
"provider_url": "https://spotify.com",
"type": "rich",
"title": "Sky"
}
}

Can you tell me how to retrieve this again?