it is incredibly ironic that after i went through a lot of effort to get a working USB PD debugger, the first USB power related issue i try to debug in anger seems to be completely unrelated to USB PD, and also somehow fixed itself when i inserted the debugger
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what issue? my phone shows 15% battery. i plug it in. an hour later, the phone proudly tells me it is "0% · Charging"
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USB-C has the nice feature of making an effectively random choice about which side is supposed to be charged. A phone will happily start charging a power bank. The devices are supposed to negotiate and automatically swap if it doesn't make sense. It doesn't seem to work well.
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in this case it's a wall wart that doesn't even have PD (well, no PD messages are being exchanged)
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I've tried plugging it into a PD power source. absolutely nothing happens. no charging, no PD messages, nothing.
¯\_ (ツ)_/¯
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Which phone model is it? I might actually have the solution to your problem.
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For the Pixel 2 XL, the issue we had is that the LG battery kernel module was broken when built into the kernel instead of loaded as a dynamic kernel module. I'd guess that you're using an OS build with it built into the kernel and maybe it's missing appropriate workarounds.
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That’s an older Qualcomm solution right? It’s probably driven by a kernel driver instead of dedicated firmware... (I wish I was kidding)