Immersive Portals has dynamic dimensions, created by running /dims clone_dimension. Unfortunately, these dimensions do not work with travelers titles, not prompting a title at all.

in the video the resource pack i was using had the line "travelerstitles.example.example": "Title for Dimension" in the lang file, correctly formatted.

en_us.txt

(lang in use, changed to txt for github)

latest.log

log doesn't seem to have anything useful, but i've included it regardless.