更新：

1. 更新前置lib39版本

build.gradle

@@ -185,9 +185,10 @@ void onlyInData(Runnable action) {
 
 dependencies {
     implementation(jarJar("io.github.llamalad7:mixinextras-forge:[0.4.1,)"))
-    modImplementation("blank:freecam-1.20.1:1.2.1")
+    modCompileOnly("blank:freecam-1.20.1:1.2.1")
     onlyInClient {
         modRuntimeOnly ("blank:firstperson-1.20.1:2.6.2")
+        modRuntimeOnly("blank:freecam-1.20.1:1.2.1")
     }
     onlyInServer {
         modRuntimeOnly("curse.maven:spark-361579:4738952")

gradle.properties

@@ -32,7 +32,7 @@ emi_version=1.1.22+1.20.1
 player_anim_version=1.0.2-rc1+1.20
 geckolib_version=4.2.1
 curios_version=5.5.0+1.20.1
-lib39_version=0.3.4
+lib39_version=0.3.6
 accore_version=1.20.1-26H4
 super_lead_version=1.20.1-1.2.1
 ## Mod Properties