I'm not sure. It's been in for a while, so I'm not sure what state it's in. One timer certainly works, but I'm unsure if anyone has used the cascading timers....
I'm also not sure what I used to test them, as I can't find any cascading demos...
If you have a simple example - with source, then I can take a look....
Here is a simplistic sample that utilises 3 cascading CTC timers/counters to increment a counter every 1 second and displays the count on the screen.
In Cspect, the counter CTC2 does not cascade from the previous counters, which can be seen. Whereas, on Next hardware, the counter will tick over every second as expected.
https://github.com/blackcataussie/ZXNextCTC/blob/main/CTCTest.asm