Version 2.12.0-259.12.beta

* Cherry-pick 98d5ecb5533d20677430b168e6672260cf2c2b4e to beta
* Cherry-pick refs/changes/60/183960/2 to beta
* Cherry-pick 7ce8e3ba2e224f36441e0f0c833a5eb7a1111e0b to beta
diff --git a/tools/VERSION b/tools/VERSION
index 58e23d3..856cb76 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -28,4 +28,4 @@
 MINOR 12
 PATCH 0
 PRERELEASE 259
-PRERELEASE_PATCH 9
\ No newline at end of file
+PRERELEASE_PATCH 12
\ No newline at end of file