Anyone know if the Chorus maintenance is going to fix loss of IPv6 issues on fibre?

I have recently moved to fibre 100/20 with Voyager/Chorus. My IPv4 is all ok.

I have a Chorus ONT version 2 and an HG659 with V100R001C297B011 firmware.

IPv6 was fine when I was on VDSL.

I have had no response from Voyager support (apart from an automated reply) this week on my loss of IPv6.

I see that Voyager Internet Status shows that Chorus is doing scheduled maintenance between 2 and 17 April.... No details given... is it just a wait and see...

I see that there were a lot of issues back in October 2018 with 2degrees and IPv6 going AWOL.

TIA