Latest Windows Store version works great, thanks.

<r><QUOTE><s>[quote]</s>Dear user,<br/>
Thanks for the valuable information provided. Our dev are working to fix this issue, in the meanwhile you can download the latest version avaialble from Windows store that should now allow again to modify furniture <br/>
Best regards,<br/>
Sweet Home 3D Team<e ...

[=D>] Excellent presentation of the problem and the steps to reproduce it! (You're a developer?)

Yes, I am. However I had some help from ChatGPT (which I was already using to troubleshoot the issue).

<r><B><s>[b]</s>Summary<e>[/b]</e></B><br/>
<br/>
After upgrading Sweet Home 3D via the Microsoft Store, the Modify furniture dialog no longer opens for furniture items that already existed in my plan. Newly added furniture works correctly. The same plan works perfectly in Sweet Home 3D 7.4, so this ...