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I'd try verifying the grounds for the drivers front corner. you can definitely get weird performance with a bad ground. things can change as the system tries to find a ground path for any given bulb. With the headlights off the turn signal will tend to back feed into the marker light circuit, but since it has to run through the additional light filaments it is higher resistance path and therefore the current is reduced and the bimetallic strip doesn't get as hot causing the fast flashing. Then when you turn the lights on the whole thing changes as the markers now have power and can not be used as a ground path....
Not sure what work was done associated with the front end damage, but if there was paint involved it is a good possibility the ground point had paint applied that wasn't fully removed to ensure a good metal to metal connection for the ground path.
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