I've also encountered this issue on a 1.15.2 server. The lag spikes are definitely noticeable and interfere greatly with combat, especially on low-end machines.
@intsuc
Making sure that the latest /forceload command on a server doesn't fail did the trick. Thanks!
I can also confirm this for 1.15.2. Does anyone know of any workarounds for this issue?
@PhiPro
This is a very good synopsis of the issue. I tested out your workaround, and I can confirm that it works exactly as written. Good work!