Carriage slowly drifting to rear left

I thought I'd fixed my problems and then new ones showed up.

So I managed to get a decent benchy printed at last, then a friend recommended I switch nozzles back to a 0.4 for the initial tests. I did and after some fiddling with the bltouch probe I got it back in working order.

Then as I went to do a first layer print, the carriage scraped the bed and after that I've been noticing the carriage has been slowly drifting to the rear left of the printer whenever it moves diagonally to the front right. When it did the initial bed levelling, it drifted further until the bltouch was off the bed and it collided with the carriage.

I had prior taken the belt system apart and reassembled it. All layer shifting was cleared. This started pretty much immediately after the first layer test scraped the bed. I retensioned the belts and they feel even, but I'm not sure the cause anymore.

Direct movement up or down, left or right is smooth. No stutters, no shifting along another axis. It's only when it moves diagonally and only seems to be when moving forward-right.
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