no more ipv6 on mobile data APN editing, switching back to ipv4 only. FP4 same sim worked perfectly fine.
just switched a FP4 device with german o2 reselling provider (drillisch brand) to a FP5 device fresh from scratch on the FP5. seemingly, the mobile data network now always reverts back to ipv4 only on this FP5 machine.
in the FP4 this very same SIM (hardware) also had like a default state of ipv4 protocol only, but one could edit it to ipv4/ipv6 dual stack setting. it would stick and keep that value and mobile data allocated both ipv4 (although RFC1918) and one single global unicast ipv6 address.
no ipv6 on mobile data any more. is this a known bug, or maybe only a hiccup of a certain mobile tower or cell situation at the moment? anyone else having this issue? thanks.
p.s. issue solved, save settings … upper right corner, helped. sorry mybad, 