Perhaps the creation date is not available in the second case. Try this from my daily note template:
<%tp.file.title%>
[[Dailies/<%tp.date.now("YYYY-MM-DD", -1, tp.file.title, "YYYY-MM-DD") %>]] | [[Dailies/<% tp.date.now("YYYY-MM-DD", 1, tp.file.title, "YYYY-MM-DD") %>]]
This has the added benefit of emiting the correct links if you ever create a daily note on a day different than the note itself (e.g. creating tomorrow’s note ahead of time)