Matches made during 5* Thor's board shake are not actually counted as part of your turn

You do get the AP from any such matches, I am not saying you don't.
I'm saying those matches are not counted as part of your turn.
And by this I mean they are not counted as part of your turn in relation to a character such as Shang-Chi, where you need to make a red or purple match during your turn to avoid losing his combo points.
When I initially noticed this I was surprised because I knew Thor's board shake had made a red or purple match, and so I shouldn't have needed to make another red or purple match.
In some cases I couldn't make another red or purple match due to the board condition, and because I didn't have the red or purple for Shang-Chi to set one up. But I'd make my non-red or purple match confident that Thor had already made one for me, and was surprised to see Shang-Chi lose his combo points.
After noticing this I started actively testing it, which wasn't a fast or easy feat because it meant playing matches until Thor's board shake made a red or purple match (it happens infrequently), and when it did and when I then intentionally avoided making another red or purple match I was able to confirm that Shang-Chi lost his combo points. Every single time.
Therefore, even though you get the AP from Thor's board shake at what you think is the start of your turn, your turn has not actually begun.