Oh some kernel params and other settings can help with that. These are mine, and it's been working great:

Kernel params

    ## Seems to be needed for suspend to S0 (s2idle) without hanging (only needed on p16s)
    acpi_osi="Windows 2022"

    # Prevent spurious wakeups from a firmware bug where the EC or SMU generates spurious "heartbeat" interrupts during sleep
    acpi.ec_no_wakeup=1

    # Prevents dock from waking up laptop right after suspend
    usbcore.autosuspend=-1

Other settings (executed with a systemd service) (also only needed on p16s, not on my p14s)

    # Disable Thunderbolt PCIe root port wakeup (RP09)
    echo disabled > /sys/devices/pci0000:00/0000:00:1d.0/power/wakeup || true

    # Disable USB XHCI controller wakeup
    echo disabled > /sys/devices/pci0000:00/0000:00:14.0/power/wakeup || true

    # Disable ACPI wakeup for XHCI and RP09 (toggle if enabled)
    grep -q "XHCI.*enabled" /proc/acpi/wakeup && echo XHCI > /proc/acpi/wakeup || true
    grep -q "RP09.*enabled" /proc/acpi/wakeup && echo RP09 > /proc/acpi/wakeup || true