Since 1.19.70, ghast voices are very quiet. If you get close, you can hear a voice, but the voice is very small and difficult to notice.
Even after quitting the game and playing it again the problem is still there.
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This is a result of the βfixβ for MCPE-35222. That fix simply changed the "min_distance" for ghast sounds in sound_definitions.json from 100 blocks to 0 blocks. This number sets the distance from source at which sound begins to attenuate. The patch pack that I had attached to that report can also be used to patch this issue, since my pack takes a more moderate approach by setting "min_distance" to 32 blocks.
The main problem, however, is that the Bedrock sound engine uses exponential attenuation as described here: https://bugs.mojang.com/browse/MCPE-164935?focusedId=1215305&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-1215305 This makes all sounds in Bedrock too loud up close and too quiet far away. Itβs a constant annoyance with many other sounds, for example player hits in pvp or villagers walking up to you or chests you stand next to and open can be so loud you that have to turn your volume down, but then you can barely hear interactions 6 blocks away.

Yeah, it's getting a bit annoying walking round in the nether, and you can't hear the ghast, all you hear is the boom when the fireball hits. It makes it more thrilling though π
Experiencing the same issue on Windows. I believe this has to do with the new change to how their sound fades away the further you are.