jimfs not found if many mods are loaded - race condition?

[LucilleTea]

The error in question:
message(27).txt

This error occurs on Java 15.0.1 and 15.0.0.36, but not Java 14.0.1.7.
It occurs with a combination of mods loaded, it's hard to narrow down a specific combination.

It's always reproducible with this mod list:
[✔️] cadmium-fabric-0.1.0-lucilletea.1
[✔️] fabric-api-0.25.1+build.416-1.16
[✔️] hydrogen-fabric-mc1.16.4-0.1.2-SNAPSHOT
[✔️] lithium-fabric-mc1.16.4-0.6.0
[✔️] notenoughcrashes-2.1.4+1.16.4
[✔️] phosphor-fabric-mc1.16.1-0.6.0+build.7
[✔️] sodium-fabric-mc1.16.4-0.1.1-SNAPSHOT
[✔️] voyager-1.0.0
[✔️] Xaeros_Minimap_20.27.2.1_Fabric_1.16.4
[✔️] XaerosWorldMap_1.11.0_Fabric_1.16.4

It will also occur with any one of Hydrogen, Lithium, and Phosphor disabled, but not when all of them are disabled.

We get some extra errors with Not Enough Crashes disabled:
https://paste.ee/p/Uy01x

[LucilleTea]

The issue reportedly also occurs on Java 14.0.2+12.

[ImperatorStorm]

Confirmed reproducible on OpenJDK Runtime Environment GraalVM CE 20.3.0 (build 11.0.9+10-jvmci-20.3-b06)

[LucilleTea]

Occurs on OpenJDK 11.0.9.1 with this log:
https://paste.ee/p/mu35T
Reported by Snivyer

[DragonEggBedrockBreaking]

Occurs on OpenJDK 11.0.9 confirmed.

[Snivine]

seems to occur in all versions that are not JDK/JRE 8

[squishycat92]

Can confirm on AdoptOpenJDK 15.0.1.9 Hotspot.

[DragonEggBedrockBreaking]

Can confirm on AdoptOpenJDK 16

[Snivine]

This still hasn't been addressed afaik, so it makes sense is still occuring, tho I'd see that maybe newer JDK/JRE versions can indirectly fix this