Thank you very much for sending me your forms and data attachments. I have been unable to reproduce the issue. I uploaded both forms and attachments to a Central v2024.3.1 server and using Collect v2024.3.3 I see that when I create or update Entities in one form, I see the updated values in the forms that use those Entities.
One thing I did notice is that the zip file you sent me with form attachments included CSVs with the same names as your Entity Lists. The first time I added attachments to a form, I dragged the full contents of that folder into Central and that replaced the Entity List link with a static CSV. I had to click the "link to Entity List" button to re-establish the connection.
Accidentally using a static CSV could potentially explain why you are not seeing offline Entities. If you did this, you would still see Entities created and updated as expected in Central, but you would see not see those changes reflected in Collect.
I hope that turns out to be what it is but if not, we'll keep trying to figure it out.
One thing you could also try is using the beta that we have recently published. When using a beta, you can go to Experimental settings and see lists of all Entities on the device, including their online/offline status. That could give you additional insight.