The Text To Speech engine will say certain swear words and slurs if you replace certain characters with an asterisk.
For example, let's say Apple is a banned swear word.
Typing A**** or even A*ple will cause the TTS engine to say Apple in full.
The linked video shows this bug in action, showcasing every example I was able to find. There are likely more I simply haven't discovered yet. This was recorded on the official scratch website.
Video:
Warning: Contains Rude Language and Racial Slurs
https://github.com/user-attachments/assets/4201913c-545e-4e8e-a3ae-0bad4685101a
Here's a link to the sprite seen in the video:
https://drive.google.com/file/d/11No4L-vgiJeW-KGTczVB41WxJrSYGxil/view?usp=sharing