This issue explains why cave collapses seem to occur much more frequently than expected.

1. once collapse occured
2. a hole forms
3. if the hole is outside the supporting range, it cannot be supported with a beam without risking a collapse.
4. endless collapse even with thousands of beams.

To prevent this on current version.

->make three block wide vertical deep mining pit.
->start mining only inside a natural cave.

• never mine outside of supporting range

Why this happens?

->Collapse trigger range is too wide. any block in the support beam area can trigger collapse.

black - horizontal support beam
green - supporting area
purple - block that broken
yellow - collapse trigger range but safe
orange - possible be collapsed range
red - real hole that formed before

I know that creating a 'hole' requires many conditions, but the collapse chaining mechanism makes it much easier, and no one ever prevents mistakes.
Anyway, the point is that there is a chance an unsupportable hole may occur.

How to fix it?

->make collapse trigger range narrower than support beam's one.
or
->make no collapse trigger happens in support beam's area.

This amounts to a suggestion and can be discussed on discord