According to:
This has been the case for a long time. The issue is that this Chaos component is sending a reliable RPC every tick, which is not desirable as it can very quickly overflow the limits, as you experienced.
At this point I think it’s worth reporting this as a bug. It’s unclear from the above link if this was ever logged: https://www.unrealengine.com/en-US/support/report-a-bug
I don’t think you will be able to fix it in Blueprint. I don’t know how comfortable you are with C++ but I think this is the only way to fix it yourself right now. Let us know if you want to do it, it should be fairly easy if we can guide you. You will need to download Visual Studio but otherwise your project won’t require any big change and you will still be able to use Blueprints and carry on as if nothing happened.