do not paralellise steps updates

src/pages/Editor.tsx

@@ -1262,7 +1262,7 @@ async function updateStepContents(
             relativePositions,
         )
 
-        const tasks = step.children.map(async (child) => {
+        for (const child of step.children) {
             const {
                 content: childContent,
                 relativePositions: childRelativePositions,
@@ -1279,10 +1279,6 @@ async function updateStepContents(
                     childRelativePositions,
                 )
             }
-        })
-
-        for (const task of tasks) {
-            await task
         }
     }