The local favorite finished sixth in FP1 on his works Ducati, but was caught up in a late incident with LCR Honda’s Alex Marquez.
Bagnaia came through the first sequence of corners and was slowly rolling over the racing line into Turn 3 when Marquez approached at high speed.
The LCR rider was forced to abort his lap, while Gresini Ducati’s Enea Bastianini – who was behind the duo – also had to abandon his last flying lap.
Bagnaia was called up by MotoGP Race Direction after FP1 and picked up a three-place grid penalty for Sunday’s Misano race.
A brief statement from the FIM Stewards Panel reads: “On September 2, 2022, during the last round of the Grand Premio Gryfyn di San Marino E Della Riviera di Rimini FP1 session, you were observed driving slowly on the racing line, causing a dangerous situation for other racers.
“This contravenes specific instructions given to competitors and MotoGP teams, disrupting the session, and is considered irresponsible driving putting other competitors at risk.
“It is therefore a breach of article 1.21.2 of the FIM World Championship Grand Prix regulations.
“For the above reasons, after receiving an initial briefing and after receiving several email reminders and warnings to riders and teams over the past season, the FIM MotoGP Stewards Panel has imposed a penalty of three seats on the grid.”
Bagnaia is contesting its home round at Misano just 44 points off the championship lead after winning the last three Grands Prix.
After dropping 91 points after a fourth DNF of the campaign at the German GP in June, Bagnaia’s recent purple patch has revived his championship hopes.
Reigning World Champion and current leader of the standings Fabio Quartararo led the FP1 this morning with Jack Miller’s sister Ducati team.
Future Bagnaia factory team-mate Bastianini was seventh after the incident, while Alex Marquez was left in 14th after being forced to abort his final lap.
. contender title MotoGP Bagnaia hit by fall grid San Marino