Thank you @arminunruh
I didn’t know that we could delete the phone layout and create a new one.
I tried that and it fixed the issue!
Regarding the “Not syncing text” warning, it never appeared for me and I believe I figured out why.
That warning only appears when a text element is created in one layout, then added to the other layout with the sync option, and only after that the text is edited with an Expand/Collapse Link.
But when the text element is created in one layout, edited with an Expand/Collapse Link first, and only after that added to the other layout (with the sync option), the warning doesn’t show up and the links get synced between both layouts.
Also, even with the first method, the warning doesn't show up when the Expand/Collapse Link is inside a Table Element.
I think these are the reasons why the issue happened in my case, unfortunately.
Do you think it would be possible to make these behaviors more consistent by default?