getServersCopy() - NoSuchElementException

Hey, i'm developing for Waterfall and need to retrieve the server list every now and then.
I'm using the getServersCopy() method provided by Waterfall in the ProxyServer instance, as the other one is marked as deprecated.
However, i started to notice some weird behaviour lately, throwing the following exception everytime the getServersCopy() method is called:

[21:43:23] [pool-10-thread-5/ERROR]: java.util.NoSuchElementException
[21:43:23] [pool-10-thread-5/ERROR]:     at gnu.trove.impl.hash.THashIterator.moveToNextIndex(THashIterator.java:139)
[21:43:23] [pool-10-thread-5/ERROR]:     at gnu.trove.impl.hash.THashIterator.next(THashIterator.java:91)
[21:43:23] [pool-10-thread-5/ERROR]:     at gnu.trove.map.hash.TCustomHashMap$MapBackedView.toArray(TCustomHashMap.java:729)
[21:43:23] [pool-10-thread-5/ERROR]:     at com.google.common.collect.Iterables.toArray(Iterables.java:295)
[21:43:23] [pool-10-thread-5/ERROR]:     at com.google.common.collect.ImmutableMap.copyOf(ImmutableMap.java:406)
[21:43:23] [pool-10-thread-5/ERROR]:     at com.google.common.collect.ImmutableMap.copyOf(ImmutableMap.java:391)
[21:43:23] [pool-10-thread-5/ERROR]:     at net.md_5.bungee.conf.Configuration.getServersCopy(Configuration.java:189)
[21:43:23] [pool-10-thread-5/ERROR]:     at net.md_5.bungee.BungeeCord.getServersCopy(BungeeCord.java:648)

Restarting the proxy fixed this for some time. The issue will however come back after some hours to a few days.
I'm also using the Cloudnet v3.4 orchestration to dynamically create servers at runtime. First i suspected the problem there, but a developer told me it's not caused by cloudnet.

I'm running the build from @Janmm14 (https://github.com/PaperMC/Waterfall/pull/609) for a while but only recently noticed this error. So i thought it's unlikely to be related to the dos mitigations.

Java 8
Debian 10

I'm not sure how to reproduce this other than just lettings the proxy run for a while.
I am willing to investigate furthe,r but i'm kinda out of ideas now.

//Edit the code that triggers the exception is:

for (ServerInfo server : ProxyServer.getInstance().getServersCopy().values()) {
...
}

Start by reading Configuration.getServersCopy() at Configuration.java:189 and its caller BungeeCord.getServersCopy() at BungeeCord.java:648. Investigate the failure while server entries are created or removed dynamically, using the reported CloudNet setup as context. Done means repeated server-list retrieval no longer throws NoSuchElementException under runtime server changes.