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I've seen this happen a fair amount. The safety torx bolts securing the chainring to the spider can work loose/fall out which leads to the failure. It's a terrible design that prevents user maintenance without having a set of safety torx keys. This is something that would be covered under warranty without quibble if still within the 2 year warranty period, (if not still worth trying with a Shimano dealer as they will still often send the failed chainring back to Madison for you if you cover postage/bribe with biscuits ect). 32/34T chainrings are in stock with Madison, 30T currently out of stock...
I've never experienced 3rd party (1x) chainrings causing any issues when used with a Shimano drivetrain, so as long as your current chain/cassette wear isn't excessive and you're using an appropriate 12spd chainring. Best practice would be to fit a new chainring when replacing your chain & cassette to allow even wear through your compete drivetrain.
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Soulnerd
I’ve just had an SLX (M7100) chainring break on me, the outer ring coming detached from the spider. I’m looking at a one-piece replacement, and have so far found offerings from Unite, Burgtec and Wolftooth.
Does anyone have any experience of these? I’ve found suggestions that the Unite and Burgtec tooth profiles may not work as well with the Shimano chain.