On the plus side, its a one off and this isn’t an incident of long term exposure. On the downside, there’s always the possibility that even that one exposure could lead to problems a lot further down the line. However, you may well have been exposed in the past unknowingly as we all might have been. I wouldn’t panic or worry too much although I do appreciate it will be concerning. I’d dump the clothes as a precaution.
I asked the manager when we were in the cage. He replied asbestos cement, its pretty ancient looking and is damaged here and there
If your manager knew it was asbestos and willingly exposed you, I’d be very angry and I wouldn’t accept this 😡