It seems you've hit into a known bug which affects Confluence 6.15.3 due to its Tomcat version. You can read more about it in the bug report below.
There is a workaround to downgrade Tomcat but we'd recommend implementing the Apache and Nginx content type overrides instead, which requires updating your reverse proxy's configuration.
There are some comments about that in the bug report, but you can take a look at Florian's comment here.
Regards,
Athirah
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