Here is a picture of it💛

No, new plantlet shouldn't die. 'Mother leaf' is supplying moisture and nutrients to it. That leaf will not last forever, and slowly will dry up and die. In the meantime, plantlet should be growing bigger and bigger. I leave original leaves there until they completely dry up and shrivell. Then they detach themselves, and can be removed. What is happening is normal. If you were watering a lot, you may have sped up decay of original leaf, but it eventually dies anyway. I have some that last for a very long time, others dry up faster.

Thank you so much for taking you're time to help me💖 That made me very happy to hear, that my propagation did succeed😀 Have a nice summer☀️

Oh by the way, how often should I water it at this stage?

When soil dries up...that depends on your temperatures and drainage of the soil. If it has roots, treat it as any plant. But do not check to see if there are any roots by pulling plant out, it may break them. You said it has roots, so just let it grow.

Thank you very much again for the help and the advices⚘