Fix a bunch of compiler errors

versionProperties/1.20.6.properties

@@ -4,8 +4,7 @@ minecraft_version=1.20.6
 parchment_version=1.20.6:2024.05.01
 compatible_minecraft_versions=["1.20.6"]
 accessWidenerVersion=1_20_2
-builds_for=fabric,neoforge
-# neoforge can be added once the issue with mixins has been resolved
+builds_for=fabric,neoforge,forge
 
 # Fabric loader
 fabric_loader_version=0.15.10
@@ -38,7 +37,7 @@ fabric_api_version=0.97.8+1.20.6
     enable_canvas=0
 
 # (Neo)Forge loader
-forge_version=50.0.0
+forge_version=50.0.19
 neoforge_version=20.6.70-beta
     # (Neo)Forge mod versions
     starlight_version_forge=