MC-91893 was said to be fixed for this snapshot, but this sound is still missing a subtitle.
"Portal whooshes" is its ambient sound which already existed.
Linked issues
relates to 18
MC-177078
Sound event minecraft:entity.minecart.inside does not have an associated subtitle
Resolved
MC-184622
Sound for exiting a portal/travelling to another dimension does not use its subtitle string despite it existing in en_us.json
Resolved
MC-177075
Taking product out of stonecutter produces no subtitle
Resolved
MC-177079
Ghast affectionate screaming sound still lacks the subtitle
Resolved
MC-177110
Mob stepping sounds are inconsistently subtitled
Resolved
13 more links
Why is the summary "t"?