Hi there,
Yea, @msfujino is also looking into it, appears that maybe different methods are required for the different levels of Sleep. Hmmm 
Just because I like hearing myself; I would have checked if this device meets the minimum requirements in any New Xiao’s today.
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Battery Monitor
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Interrupts
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Sleep modes
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RTC
Then get cute with Peripherals, FastSPI, CAN bus, Dual Radio’s (concurrent)
i3C , WiF6, 5G , IOT.
Then have the Stacks or SD’s to back it… Zigbee, Thread, Matter, 4Mb PHY…
Someone kick me I’m dreaming…LOL
Anyway, expect the weirdness to continue Until we get the full 411 on this thing, until then for that reason , Like M Cuban "I’m Out "