With both 22.03.3 and 22.03.5 (official releases) the SFP works for me with PPPoE, with both IPv4 and IPv6 (KPN in The Netherlands). But I could get it working only after disabling autoneg and setting the speed to 1000Mbps with ethtool.
Upgrades would be somewhat simpler if ethtool (or ethtool-full) were packaged in the standard upgrade package instead of only as add-on. Not having an internet connection directly after upgrading makes installing ethtool a bit more challenging.