Not a JSON object: null; Input is not a list of 4 elements

[Mew2K]

Issue Description: Loading this map causes the following warnings/errors to be thrown to the console. Note that it seems the warnings also get thrown on a regular 1.8 instance of PGM, but the two errors are unique to this 1.20.4 version. I am unsure if any gameplay bugs result from the errors.

Map: DK Crossovers DTE

Version: PGM-0.16-SNAPSHOT-3c8fd1f9.jar

Stack Trace:
[14:29:28 WARN]: [PGM.MatchImpl] [MatchImpl] VariablesMatchModule implements Listener but is not annotated with @ListenerScope
[14:29:29 WARN]: Skipping Entity with id Itemframe
[14:29:29 WARN]: Skipping Entity with id Itemframe
[14:29:29 WARN]: Skipping Entity with id Itemframe
[14:29:29 WARN]: Skipping Entity with id Itemframe
[14:29:29 WARN]: Skipping Entity with id Itemframe
[14:29:29 WARN]: Skipping Entity with id Itemframe
[14:29:29 WARN]: Skipping Entity with id Itemframe
[14:29:29 WARN]: Skipping Entity with id Itemframe
[14:29:29 INFO]: [PGM.MatchManagerImpl] [MatchManagerImpl] Loaded match-7 (dk_crossovers_dte)
[14:29:29 ERROR]: Not a JSON object: null; Not a JSON object: null; Input is not a list of 4 elements
[14:29:29 ERROR]: Not a JSON object: null; Not a JSON object: null; Input is not a list of 4 elements