If you're seeing tail chaining rather than preemption, then it's possible that NVIC priority grouping isn't configured as you expect - and thus configuring the two interrupts into priority groups 0 and 1 has no effect on interrupt preemption.
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If you're seeing tail chaining rather than preemption, then it's possible that NVIC priority grouping isn't configured as you expect - and thus configuring the two interrupts into priority groups 0 and 1 has no effect on interrupt preemption.