modern sites on my site collection do not have a working edit button. The issue is inconsistent, Previously it was working but from last couple of days Edit button is not showing.
I have full control over the entire collection, so permissions shouldn't be the issue.
I tried multiple browsers, windows clearing the browser cache, and have determined that it's universally affecting all users regardless of browser.
Tried to add "?ToolPaneView=2&Mode=Edit" to the url to check whether they could be edited still it's not working.
I can confirm that these sites were editable a couple of days ago, After, Did R&D on that i came across to know that i need to install latest Sharepoint updates. So i updated kb5002135 to kb5002180 though it is not visible.
Run the SharePoint configuration wizard but still same issue.
Before : enter image description here
After : enter image description here
I had exactly the same symptoms as described, and none of the suggestions identified in question worked for me either. We do now have a solution. KB5002206 & KB5002207, released in May 2022, did solve our problem and the Edit Button returned across all of our browsers and environments. In all cases it was necessary to use ctrl-F5 to force a refresh of the cache in the Browser.