I think you need to reread what the white bar transit signal meant
The online version of the Ontario bus handbook. Use this book to study for your B and E licence, test your knowledge and prepare for your B and E road tests.
www.ontario.ca
The white bar is a protected phase in which the transit vehicle has complete right of way to perform whatever direction it wants to go. All other directions sees a red signal and should yield to the transit vehicle.
You see a green arrow on the QQ signals as the streetcar (or bus using the ROW) doesn't not have complete right of way to perform turns while cars are given green to proceed forward. Back in the days before the rebuild, on QQ, there is a "white bar" phase where streetcars would proceed first while everyone else gets a red. Then streetcars get a red while cars are free to make left turns or go straight.
Although the white bar should only activate if the streetcar issued a turn signal (that's how it is setup), the streetcar can do whatever it wants when they get the signal.