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Java 11 - ConcurrentModificationException with 1.2.0 update

See original GitHub issue

[07:52:08] [Server thread/INFO]: [BentoBox] Hooking with Vault...
[07:52:08] [Server thread/INFO]: [BentoBox] Hooking with PlaceholderAPI...
[07:52:08] [Server thread/INFO]: [BentoBox] Loading addons...
[07:52:08] [Server thread/ERROR]: [BentoBox] Skipping BSkyBlock due to an unhandled exception...
[07:52:08] [Server thread/ERROR]: [BentoBox] STACKTRACE: ConcurrentModificationException - null - null
[07:52:08] [Server thread/INFO]: [BentoBox] Loaded 2 addons.
[07:52:08] [Server thread/INFO]: [BentoBox] Enabling addons...
[07:52:08] [Server thread/ERROR]: [BentoBox] Skipping Challenges due to an unhandled exception...
[07:52:08] [Server thread/ERROR]: [BentoBox] STACKTRACE: ConcurrentModificationException - null - null
[07:52:08] [Server thread/ERROR]: [BentoBox] Skipping Level due to an unhandled exception...
[07:52:08] [Server thread/ERROR]: [BentoBox] STACKTRACE: ConcurrentModificationException - null - null
[07:52:08] [Server thread/INFO]: [BentoBox] Addons successfully enabled.

BentoBox/BSkyBlock is not running, despite “successfully enabled” above. Similar to (perhaps same as) https://github.com/BentoBoxWorld/BentoBox/issues/488, which was closed.

Steps to reproduce the behavior:

Download and install bentobox 1.2.0 and bskyblock 1.1
Edit configuration files as appropriate
Start server
See error

Server Information:

Database being used: YAML
OS: CentOS current
Java Version: 11

>bentobox version
[07:58:00 INFO]: Bentobox version: 1.2.0
[07:58:00 INFO]: Loaded Game Worlds:
[07:58:00 INFO]: Loaded Add-Ons
[07:58:00 INFO]: BSkyBlock 1.1
[07:58:00 INFO]: Challenges 0.3.0
[07:58:00 INFO]: Level 0.2.0