OK，Thank you very much for your support.
That just indicates that you installed Zulu OpenJDK 11.0.4 on your system. Running java -version doesn't show the version in the current directory.
I was just able to replicate the issue by placing an old jre-win.zip file from a previous version inside of the gateway's install directory \Ignition\lib\runtime directory. This then gets downloaded by the client (or designer). I'm assuming the upgrade did not complete properly and the old jre-win.zip didn't get replaced as expected.
If you didn't remove the 17.0.8 runtime already, can you navigate to \.ignition\cache\resources\runtimes\17.0.8\bin and right click on java.exe and go to Properties. The details tab should show what java version is being run.
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You're right, \Ignition\lib\runtime the jre inside jre-win.zip under files is version 11.0.4.
The root cause has been found, thank you very much for your help!
Glad we were able to isolate it. To fix the issue, you could try to re-run the 8.1.36 upgrade. Just make sure to take a gateway backup before hand.