Digital Ocean Sydney region wireguard problems

[asteele4]

I've had Algo running for 3 years on a DO droplet in Frankfurt without issues.

I wanted to create a new droplet in Sydney and the installation all worked, and then wireguard connections were successfully activated, however the when I then test it by going to https://whoer.net/ (or any other site), the connections hang and never complete.

When I first did this setup I did a fresh git clone of algo instead of using the 3 year old version I previously used so I obviously thought there was a problem with my setup that I'd forgotten about in the last 3 years.

When this didn't work, I deleted the created droplet, and for completeness, deleted and re-cloned algo, and created a new droplet in Frankfurt and it work successfully. I repeated this delete/re-create process using the London region. That too worked successfully.

I recreated the droplet in Sydney again and it still wasn't working.

I then followed the troubleshooting steps discussing MTU sizes.
[Aside: doco needs updating as the Ubuntu image no longer includes "ifconfig"]
When running the command on the sydney Algo server:
ping -4 -s 1432 -c 1 -M do github.com
I get 100% packet loss. I tried this with values of: 1432, 1400, 1300, 1200, 576. All failed.

Is this a "me" problem, or have others experienced the same issues?