We managed to reproduce the issue and it seems to be caused by wrong permissions on the cache directory after the upgrade. To fix them, please remove your cache directory by running the following command:
sudo rm -Rf opt/bitnami/apps/magento/htdocs/var/cache
Afterward, follow the steps for readjusting permissions in the troubleshooting section of our documentation.
Your site should work fine after completing these steps.
Hope it helps.
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