Do not return extensible events experimental push rules by default. (#15494)

changelog.d/15494.bugfix

@@ -0,0 +1 @@
+Fix a bug introduced in Synapse 1.73.0 where some experimental push rules were returned by default.

rust/src/push/mod.rs

@@ -568,7 +568,10 @@ impl FilteredPushRules {
             .filter(|rule| {
                 // Ignore disabled experimental push rules
 
-                if !self.msc1767_enabled && rule.rule_id.contains("org.matrix.msc1767") {
+                if !self.msc1767_enabled
+                    && (rule.rule_id.contains("org.matrix.msc1767")
+                        || rule.rule_id.contains("org.matrix.msc3933"))
+                {
                     return false;
                 }