The Spaniard crossed the line third in his Aston Martin on Sunday but was then handed a 10-second punishment that dropped him to fourth before a late-night appeal reinstated him.
Formula One posted a message from a spokesperson for the FIA, the governing body of world motorsports, who said the stewards had been caught out by "conflicting precedents" on what constituted "working on the car" serving a penalty in the pits.
The message said the topic would be addressed at an FIA committee meeting on March 23 and promised "a clarification will be issued ahead of the... Australian Grand Prix" which is on April 2 in Melbourne.
Alonso was first punished for not starting from the right spot on he grid. He tried to serve his five-second penalty at the start of a pit stop, but a mechanic allowed a jack to touch the car.
After the race finished and Alonso had stood on the podium and given interviews, the stewards, who are nominated by the FIA, finally decided that the team had been working on Alonso's car during the penalty.
They hit the Spaniard with a 10-second penalty, dropping him to fourth behind George Russell.
Aston Martin appealed and produced videos showing that other competitors had done the same in the past without being sanctioned.
The decision "was the result of new evidence regarding the definition of 'working on the car', for which there were conflicting precedents, and this has been exposed by this specific circumstance," said the FIA spokesperson.
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