Observed on the 21/8/21 via analytics for 1.16.5-2.1:

Stack trace:

Failed to initialize particle from configuration value : bassebombecraft:skullparticle N/A(user not available in server);Linux,5.4.0-73-generic,amd64;1.8.0_292;JVM args:-javaagent:/jolokia/jolokia.jar=host=0.0.0.0,port=9899,policyLocation=file:/jolokia/policy.xml,allowDnsReverseLookup=false;-Dfml.queryResult=confirm;-Dfml.doNotBackup=true;-Dfml.readTimeout=180;-Duser.timezone=America/Lima;-XX:MaxMetaspaceSize=200M;-Xmx2300M;-Xms1150M;1.16.5;36.2.0;20210115.111550;