Same problem here... please do not talk about "internet connection problem"!
The problem persist from years now. I have Evernote on Android, iPad, Macbook, iPhone and the problem is always the same: even if you make a small change on an existing note and you quit the app, this change is not uploaded and you can't find it on other devices. The only way is to reopen the app where you made the change and wait few seconds. This problem persist even with new devices that I owned so is not related with the device or with the internet connection (I tried wifi, 5G, Ethernet cable..........)
The legacy version had the ability to quit "only" when all the changes were synced to the server... is probably to complicate to achieve this behaviour again?