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[ASIKWUSpulse]

Sound samples of how it sounds

[Saga Musix]

If you use an old instrument in a newly created song in OpenMPT 1.28 - yes, it will sound different. You will need to update those instruments to use the new release node logic. If this is an old, unmodified module sounding different in 1.28 compared to a previous version, it is a bug - please report it on our issue tracker in that case.

[ASIKWUSpulse]

Sound samples of how it sounds

is music-previews of a module I created in 2013 using this volume-envelope and when OpenMPT 1.22 was the latest version. It worked at that time

(Notice how the guitar sounds in the previews)
The sample "how it originally sounded" is the module played in it's right version of OpenMPT; 1.22. The sample "how it sounds now" is the same module played in the current version of OpenMPT.
I don't know if it was a bug or not, either way it was changed not so far after in a new version of OpenMPT, then it started sounding tah-taggatagga (the jump-to-full-volume release making an apparent visibility in the distortion plugin) instead of tah-tam-tam.

Then, maybe I should report it on the issue tracker?

[Saga Musix]

Yes, please open an issue about it.