Sounds like you have enough supports, just have to secure those sections before they move like that one did.
The forces imposed on the soil is dispersed in a 45 degree angle, so when undercut, like in the photos, no doubt in those soils, (sand or fine soils ?) could easily do what you have shown.
I see you have the others concerned about your methods, for a residential, home you have bent the rules a tad, but having extra columns, a decent size beam, worst case scenario already happened, no one was in the way and nothing compromised, though you are brave for posting here for unduly reminders of safe methods.
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