I’ve tried this both ways, and this actually tracks with some variations in behavior I saw from the<span style=”font-size: inherit;”> switcher.
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Saving from the pedal seems to just deselect the amp and cab on the switcher, which makes sense if a PC message is being set – it would effectively activate an empty preset on the switcher.

Saving from H90 Control ultimately causes the switcher to reboot, presumably from the sysex traffic.

It doesn’t seem desirable to transmit any MIDI messages at all on save though? I can probably live with the “save from pedal” behavior by making sure I have a corresponding preset on the switcher that has a usable configuration, but it’s not ideal.