Test all sample-modules in 1.28.00.43.
Then test each one of them in respective version they were last saved with.

Repeat both steps above with playing the sample-instruments included with the modules;
Hold any key until the envelope-cursor reaches sustain-loop - only to see it be ignored when release-node is enabled

You can as well try playing the sequence in "1.28.00.40 module.mptm" in OpenMPT 1.28.00.43 to hear the instrument "Creak Pad" fading away in rows 32-47 in pattern 1. Creak Pad uses sustain-loop along with the Release-node - it's the same instrument as in the two other modules marked "1.27 Instrument" - Note that it has the sustain-loop on the release node, apart from "1.22 Instrument" that has it before the release-node