The terms might have been "System Image" and "Vendor Image". There was a new
version 18.1 dated around Jan. 25 (same number as the previous one from a month
earlier). After it downloaded those, I clicked the button to restart Waydroid
and that's when it failed to start again.
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After applying a System Update (can't remember if that's the correct term)
Waydroid no longer starts, dmesg is filled with constant messages like
[ 3427.920971] binder: 6467:6323 cannot find target node
[ 3427.920984] binder: 6323:6467 transaction call to 0:0 failed 5324/29189/-22,
size 0-0 line