Unfortunately, as mentioned here:
Important! X1C firmware 01.05.02.00 no longer sends information over MQTT for the following: AMS True Humidity %, Calculated PA value, Bed Mesh data. If you want these from these guides, I recommend downgrading to 01.05.01.00.
I’m really disappointed this information was removed. In particular, without any mention in the release notes. Thankfully, I was able to downgrade to the previous firmware version. However, I do hope the solution for me isn’t “never upgrade again”.