The bug
https://twitter.com/sekwah41/status/1027704411353702400 as seen in video from tweet.
How to reproduce
Build a setup as seen in MC-135106 to reproduce.
Cause
I believe, no block checks taking place due to there being no blocks above 255 so the properties are not being set back. As soon as you go even a single block down the effect is reset.
Can confirm for 1.13.1.
Relates to MC-135106.