ZFS rollbacks suddenly stopped working

This value for that option is potentially problematic, because kernels can run out of their support timeline, and when that happens the used kernel is actually reverted to an earlier (most likely LTS) version.
What the consequences are depends on the changes to ZFS in the period between the releases of each kernel version, but in general what happens is undefined, which makes it a dangerous thing to do.

A better option is to just pin the kernel to a specific version, and manually update it when a new kernel version is released, after verifying that that release actually has ZFS support (not all kernel releases have openzfs support).

As-is, I’d say your ZFS array is in an undefined state.

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