fix: DEV-3867: Fix RelationsOverlay with 3391 ff on (#1039)

Author: hlomzik

Diff for: src/components/RelationsOverlay/RelationsOverlay.js

@@ -1,10 +1,12 @@
 import { observer } from "mobx-react";
+import { isAlive } from "mobx-state-tree";
 import { createRef, forwardRef, PureComponent, useEffect, useRef } from "react";
 import { useState } from "react";
+import AutoSizer from "react-virtualized-auto-sizer";
+
+import { FF_DEV_3391, isFF } from "../../utils/feature-flags";
 import { isDefined } from "../../utils/utilities";
 import NodesConnector from "./NodesConnector";
-import AutoSizer from "react-virtualized-auto-sizer";
-import { isAlive } from "mobx-state-tree";
 
 const ArrowMarker = ({ id, color }) => {
   return (
@@ -265,7 +267,11 @@ let readinessTimer = null;
 const checkTagsAreReady = (tags, callback) => {
   clearTimeout(readinessTimer);
 
-  if (!isAlive(tags)) return;
+  if (isFF(FF_DEV_3391)) {
+    if (![...tags.values()].every(isAlive)) return false;
+  } else {
+    if (!isAlive(tags)) return;
+  }
 
   const ready = Array.from(tags.values()).reduce((res, tag) => {
     return res && (tag?.isReady ?? true);