This is only a security hole patch (Not a feature update). There should be no issues (loosely said). At least I don't have any issues.
you are right about the CVE patches.
When i upgraded, i got a very weird behavior. first was the UI not responding. then i discovered that the hardwire connections seemed to be in a defunct state. not getting IP's
i did a reset and restored to the previous software version along with a restore of the previous config.
Thankfully back to normal.
The dashboard doesn't show up in Chrome or Edge for Chromium using http nor https. All works in Firefox.
Clear the cache and make sure you choose "All Time". For Edge, make sure you are on Version 91.0.864.67 (Official build) (64-bit).
mine sometimes hang up need to refresh the webpage