I have recently updated to TB 128.5.3esr (64-bit) This occurred by the Microsoft Store 'update' feature automatically. Before this occurred, I was able to mark email messages with Tags that I had previous set up but it now appears that even when selecting an appropriate Tag for a particular message, whilst it initially 'coulors' it in accordance with the pre-defined colour, when my cursor is removed from the email message, the Tag is lost [and colouring]! Even when attempting to sort messages by Tags, none appear at all.... I have in my TB a number of different email accounts namely, Apple ones [x3], Hotmail [Outlook now] and Gmail and yet none of them seem to support [or retain] Tags anymore as they once did. Previous TB versions enabled me to use this feature - is there a good reason why it no longer works? Lastly, whilst I don't really know what a 'sandbox' is, I installed TB from the Microsoft Store in the hope that it would remain automatically updated - was this a mistake? Lastly this may assist TB experts of which I am most definitely not one, sadly....

128.5.2esr (64-bit) Release notes Thunderbird Windows MSIX packagethunderbird-MSIX - 1.0