1.20.1 Java RMB unresponsive, cannot place blocks. This is not a hardware issue, have tried several mice with the same result. It is also not a lag issue as people on reddit have suggested. the only thing different from vanilla is my resource pack. Please do not ignore the issue because it is an earlier version. Not everyone likes more recent versions or they may play on servers that do not handle the current version, as is the case with me.