The 4-year-old prince made silly faces and shouted during the late Queen Elizabeth II's Platinum Jubilee balcony event.
Despite not attending his great-grandmother's funeral, he made his royal holiday debut at a Christmas morning service in Norfolk, England.
An unnamed palace source stated that Prince Louis' antics may be the reason for his possible absence at the coronation.
A Kensington Palace spokesperson stated that a decision on his attendance will be made closer to the time.
Prince George and Princess Charlotte are confirmed to attend and have a high-profile role at the coronation.
Prince Louis will ride in a carriage with his siblings and parents at the coronation and on Buckingham Palace's balcony thereafter.
Prince Harry and Meghan Markle have yet to confirm their attendance despite receiving an invitation from the palace.
The Duke and Duchess of Sussex stated that they will not disclose their decision on attending the coronation at this time.