I have the same issue here with the latest installer ( Endeavouros_Cassini_neo_22_12.iso
)
No more pointer, but mouse is working. The most is a wireless Logitech MX Anywhere 2 with USB dongle. The kennel detects the most correctly.
Update: This happens only, when I connect the monitor to the AMD Radeon 7900 XT. When using the onboard DP connector powered by the Ryzen 7900X everything looks fine.
Update 2: This looks like a known issue: AMD Radeon 7900 (XTX) workaround