How to change the current active partition slot?

FAILED (remote: 'Fastboot command is not allowed fastboot get active slot fast boot Raspberry Pi OS The latest release of Raspberry Pi OS is made to get the most from Raspberry Pi 5 The newest version of our operating system fastboot change slot Reset attack mitigation for firmware-based boot modes such as fastboot being active GrapheneOS enables support for ending secondary user profile

fastboot set active slot I was able to fix this with fastboot --set-active=a followed immediately by fastboot flash boot and all the other partitions