I downloaded this demo, and ran these commands:
npm install --force #without force @vue/compat conflicts with the package.json on the vue dependency (2.6.14 vs 3.2.22)
npm run-script serve-vue3
Output to the console looks like this:

If I expand that error, the complaint is that buttons.js does this:
render(h, { props, data, listeners, children }) {
And in reading listeners, that triggers the INSTANCE_LISTENERS error.
What am I missing?
I ended up down this rabbit-hole trying to solve my own problems running the vue3-compat-build of bootstrap-vue in my app, using MODE: 3. I get that error, and similar compat errors from the normalizeSlot mixin complaining about the use of $scopedSlots.
I downloaded this demo, and ran these commands:
Output to the console looks like this:

If I expand that error, the complaint is that
buttons.jsdoes this:And in reading listeners, that triggers the INSTANCE_LISTENERS error.
What am I missing?
I ended up down this rabbit-hole trying to solve my own problems running the
vue3-compat-buildof bootstrap-vue in my app, usingMODE: 3. I get that error, and similar compat errors from thenormalizeSlotmixin complaining about the use of$scopedSlots.