The weeping vines and twisting vines are supposed to use the same sound as crimson roots and warped roots. However, these sounds were mistakenly set as the default "vines" sounds, which caused MCPE-93577.

That issue was fixed in 1.21.50.26 Preview, but now we have the opposite problem: Nether vines and cave vines (which normally have unique sounds) are using the same sound as regular vines.

The changelog mentions this:

Vine, Cave Vines, Twisting Vines, and Weeping Vines now play their correct sounds instead of the Nether Wart sound

However that was never the case, nether wart sounds were never used by any type of vine. It seems there was some confusion over the "roots" sound events.