It doesn't even need to be an error in the "assembler" but could be another part that converts from some internal highlevel IR, also for most cases split ops doesn't matter for register manipulating instructions (that you might want generated as compactly as possible) since regular atomics are separate on memory addresses.

Even then, if the code-gen was written BEFORE the preemption then it was fairly sloppy for those implementing the preemption to not consider the function epilogue, granted statically adjusting the stack/frame pointer by more than 4kb is probabably a tad of an edge-case.