RTP is a long-run average: 96% RTP means a 4% house edge, not a promise for one...

https://wiki-nest.win/index.php/Why_the_Investing_Analogy_Breaks_Down_for_Casino_Games

RTP is a long-run average: 96% RTP means a 4% house edge, not a promise for one session. Volatility shapes how often wins land and how large they may be. Short-run results can swing sharply, so you can lose more than expected.