I am running Thunderbird snap 128 esr on Ubuntu 24.4. A few days ago the usual alert popped up advising me that a new version of Thunderbird was available. I duly closed the programme, waited a little while and then reopened it. But on checking I found that it was still stuck on 128.4.2, while the release notes say that the latest version is 128.4.4. Yesterday the alert appeared again. I again closed and opened the programme but found it to be still on 12.4.2. The same thing happened again today. Any idea why Thunderbird is apparently not updating? NB: Each day the alert is reducing by one the number of days in which it says Thunderbird will be automatically updated.