Star Wars plans to further explore Grogu's Order 66 flashbacks in The Mandalorian season 4. Throughout the series, The Mandalorian has been gradually unveiling Grogu's true identity and backstory. Season 2 confirmed that Grogu was a Padawan during the Clone Wars, and subsequent flashbacks in The Book of Boba Fett and Season 3 delved deeper into Grogu's experiences during Order 66.
In Disney Gallery / Star Wars: The Mandalorian Season 3, producer Jon Favreau discussed the intention of revealing Grogu's past through flashbacks, emphasizing the desire to tell the story in incremental chapters. This led the creators to question the next chapter of Grogu's journey. While Season 3 unveiled the identity of the individual who saved Grogu from Order 66, the details of how Grogu ended up where he was in Season 1 remain mysterious. Consequently, viewers can anticipate further flashbacks and revelations about Grogu's past in future chapters of the "Mandoverse."
Source: Disney Gallery / Star Wars: The Mandalorian Season 3