X try latest go1.14.10 pre-release to see if it helps https://github.com/golang/go/issues/41303

component/golang/buildout.cfg

@@ -52,13 +52,19 @@ environment-extra =
 
 [golang1.14]
 <= golang-common
-url = https://golang.org/dl/go1.14.9.src.tar.gz
-md5sum = 6f6dd1377421d27ca4bb607283b31738
+#url = https://golang.org/dl/go1.14.9.src.tar.gz
+#md5sum = 6f6dd1377421d27ca4bb607283b31738
+path = ${golang1.14-repository:location}
 
 # go1.14 needs go1.4 to bootstrap
 environment-extra =
   GOROOT_BOOTSTRAP=${golang14:location}
 
+[golang1.14-repository]
+<= git-repository
+repository = https://go.googlesource.com/go
+revision   = go1.14.9-7-geadc935508
+
 # ---- infrastructure to build Go workspaces / projects ----
 
 # gowork is a top-level section representing workspace