I saw those:
https://forum.hise.audio/topic/635/serious-sync-problem-on-fx-plugins/2
https://forum.hise.audio/topic/1616/fl-studio-20-1-latency-with-delay/27
https://forum.hise.audio/topic/1580/hise-fx-and-delay-compensation/40
https://forum.hise.audio/topic/597/latency-problem-on-fx-plugins/25
https://forum.hise.audio/topic/3277/possible-improvements-to-exported-plugins/3
https://forum.hise.audio/topic/3493/has-anyone-successfully-created-an-fx-plugin/27
I'm not talking about bouncing.
@d-healey maybe I only can fix it by updating FLS.
but a test version could indeed help if he does like to hand it out