United Kingdom

Sounds like one was not identified and collapsed in 2017. Another was Singlewell Primary School in Kent in 2018.

https://www.msn.com/en-gb/news/uknews/the-raac-concrete-ticking-time-bomb-that-schools-were-warned-about-years-ago/ar-AA1g5cDO

When was RAAC flagged as a danger?

The lightweight concrete, which is a “porous” material, has long been recognised as having “limited durability”, according to the LGA. The Government has been aware of public sector buildings constructed with the material since 1994.

2017

The Standing Committee on Structural Safety was asked to investigate the suitability of the material after a school roof collapsed, although it is not clear which school this was.

2018

Another roof collapsed at a Singlewell Primary School in Kent. It happened above the school staff room, also damaging toilets, ICT equipment and an administration area. The collapse prompted Kent Council to write to other local authorities warning them to check for RAAC in their schools.

2019

A structural engineer investigating on behalf of SCOSS began to “frequently” encounter RAAC planks that weren’t fit for purpose and warned all those installed before 1980 should be replaced.

Never heard of it until this moment

I’m sure there’s some nice big contracts going out to construction firms that just happen to donate to certain MP’s