As you mentioned this is a known issue and we are still working on it. We are trying to find the best way to fix it without changing permissions (for security reasons).
In the meantime, you can try with the following workaround:
Connect to your server via SSH and execute:
sudo chown -R bitnami:daemon /opt/bitnami/wordpress/wp-content
sudo chmod -R g+w /opt/bitnami/wordpress/wp-content
After that, you should be able to upgrade WordPress. Thanks in advance for your consideration and patience. We will notify you about our progress.
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