Notice the presence of the Portal noise intensifies subtitle, indicating that the sound block.portal.trigger has begun playing again even though the player isn't about to go through the portal, and in fact will exit it. This sound playing is erroneous and should be removed.
I tried testing this in 12w17a and 12w19a as I suspected this bug may have been first introduced with the client-server split in singleplayer but it didn't actually affect anything.
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galaxy_2alex
Like any other subtitle, it will continue to show for a moment in the bottom right before disappearing, it doesn't suddenly disappear when changing dimensions.
muzikbike
That doesn't change the fact that the sound starts again.
pulpetti
In 1.16.1
Avoma
Can confirm in 20w46a.
ampolive
Can confirm in 1.17.1 Release Candidate 1.
muzikbike
This is fixed in 1.20 pre-release 1.