Read this: https://grapheneos.org/faq#device-support

Unlike others, Graphene has very strict requirements when it comes to devices to ensure you're safe.

As usual if you’re looking to have any security (Verified boot) GrapheneOS + Pixel phone is the only options. I really don’t get it how come people in places like this are okay with having a phone with all their personal data and logins without verified boot. Stolen / lost phone and game over.

Calyx, for instance, isn't as good as GrapheneOS, they do a lot of snitching on you (including to Google and Mozilla) and they overlook critical details such as this one allowing the OS to contact 3rd parties such as Qualcomm.

Other phone brands, let's say Fairphone just don't make thing right. Fairphone guys have been petitioned multiples times to open their platform and/or collaborate with projects such as GrapheneOS and CalyxOS so user can have private and secure phones but they don't care.

CalyxOS does support the Fairphone 4 however that's only due to the persistence and reverse engineering efforts of the CalyxOS project / community. If you decide to use it you won't have a secure bootloader anymore due to a bug in Fairphone's firmware that they choose not to fix. That's how "fair" the "Fairphone" really is.

Here is more relevant information for you from here:

XTRA is technology offered by Qualcomm Technologies, Inc. in the US and QT Technologies Ireland Limited in the European Economic Area to improve mobile device performance. XTRA downloads a data file from Qualcomm containing the predicted orbits of the Global Navigation Satellite System (GNSS) satellites. Using the XTRA data file reduces the time the device needs to calculate its location, thus saving time and battery power when using location-based applications. Newer versions of the XTRA software also upload a small amount of data to us. We use the uploaded data for purposes described in this Policy, such as maintaining and improving the quality, security, and integrity of the service. XTRA uploads the following data types: a randomly generated unique ID, the chipset name and serial number, XTRA software version, the mobile country code and network code (allowing identification of country and wireless operator), the type of operating system and version, device make and model, the time since the last boot of the application processor and modem, and a list of our software on the device

Before you say this is the CPU's fault, it isn't, at least on its own. GrapheneOS also deals with this kind of stuff and has patches and options so you can block it.