I have no Conclusive proof,
but did they have the capability to install the screws without a drydock?
Very dubious, during july 1940-november 1942 the French Vichy-government manned ships sufferred growing shortage (especially in north-africa). The situation worsening by mid-1941 (fuel lacking).
You are sure that Jean-Bart escaped France with only 2 propellers ?
(Jean-Bart escaped France with only its
half-power machinery, but half-power machinery is not necessarily the half propeller complement
)