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> Also cache control headers were added (rolling back that currently but I guess that would not do much for glance)

Well, that broke it:
allowed_headers = Cache-Control

Apparently it will disallow all default headers so it should read:
allowed_headers = Content-Disposition, Content-Encoding, X-Delete-At, X-Object-Manifest, X-Static-Large-Object

Mystery fixed :)

Cheers,
Robert van Leeuwen