The initial implementation of JDK-8003984 will disable using the secure launcher when cross launching from 32 to 64 bit (or 64 to 32 bit) architecture in JnlpxArgs.execProgram.
This is because secure launcher will reject launching when jp2launcher.exe is invoked from a jp2launcher.exe process with a different path (one is 32 bit and the other is 64 bit)
clutter.cpp code in JWC_IsParentTrusted() needs to be updated to handle this scenerio, then the two lines in Jnlpxargs.execProgram:
" if (!crossArch && Config.useSecureLaunch(jreInfo)) {" can be restored to:
"if (Config.useSecureLaunch(jreInfo)) {"