Any luck on this coz I am facing same error?
Glad to know someone else is having this issue.
Sorry to say I have not found a fix. I opened a support ticket and was told that I would need to purchase a special dev contract in order to get support on this issue. Which is a same since this call was working fine before the upgrade.
I am trying to go through with my account team for escalation. Sadly, they haven't been a help to this point. I would recommend reaching out to your account team to see if they can raise this issue internally.
Please post back if you find a fix.