About new 1.21 nether portal mechanics

I was actually depending on that new gamerule (riding player teleporting enabled)

If I can't set it to false, my datapack that locks the player in the nether becomes exploitable, by escaping on a strider.

Also enderpearls do the same thing in my case.

I knew that there were a lot of opinions about how that gamerule shouldn't be deafulting to false, but I didn't think it was going to be removed.