Sharing from Apple Music to Instagram Stories - dark grey / white border?

Hello all,

I first started using iPhone + Apple Music a couple of days ago and loved the grey "dark mode" border around album art when sharing to my Instagram Stories, as seen in the first picture. However, as of today, with seemingly no reason, everything that I try to share now results in the white border, as seen in the second picture. I also noticed that, at the same time, the sharing option in Apple Music changed from something like "Create Instagram story" to a generic "share to Instagram" option.

Has anyone else experienced this? Is there a fix or workaround? I find the white border incredibly harsh and unappealing. Thanks in advance!