Not sure if you saw this that says 24 hours before you will know
https://www.thello.com/en/paris-venice/traffic-information/
Some have reported :"Venice to Paris was stopped at Milan due to the rail strike. We then had to get a bus from Milan to Paris."
If I absolutely had to be in Paris I would do one of these currently reasonably priced direct flight and hoping to get the money back from Thelllo:
9:55 PM – 11:45 PM
Vueling
Iberia
1h 50m
VCE–CDG
Nonstop
$47
6:35 AM – 8:25 AM
easyJet
1h 50m
VCE–CDG
Nonstop
$62
8:50 PM – 10:30 PM
easyJet
1h 40m
VCE–ORY
Nonstop
$62
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Other flights
Prices are not available for: Aegean and Ukraine International. Flights with unavailable prices are at the end of the list.
9:25 AM – 11:05 AM
easyJet
1h 40m
VCE–ORY
Nonstop
$69
1:00 PM – 2:45 PM
easyJet
1h 45m
VCE–CDG
Nonstop
$74