<snip/> > It exists in all 8.5.x, 9.0.x and 10.0.x versions. It has been there > since the beginning of HTTP/2 support.
Based on our testing the issue was introduced in 9.0.19 and 8.5.55 (we haven’t done any testing on the 10.x branch), which is slightly after the beginning of HTTP/2 support. I don’t know if that is helpful information, but I provide it in case that it is. Apologies for the second email. We were still discussing this internally a bit. Thanks again for your work on this! This e-mail may contain information that is privileged or confidential. If you are not the intended recipient, please delete the e-mail and any attachments and notify us immediately.