FWIW Most MTBs these days (last 5-10 years) have moved to a single chainring with a cassette with more range. It your bike will support this id strongly consider moving in this direction. Does your current setup show this issue while shifting or when you’re on chunky trails? If when shifting, there are limit screws on the front derailer that will prevent this. If the chain “bounces” off ring and drops to the BB, you may be able to find a chain guide however id recommend moving to a single ring at the point. Newer rear derailers are spring loaded and add tension to the chain so to minimize this.
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FWIW Most MTBs these days (last 5-10 years) have moved to a single chainring with a cassette with more range. It your bike will support this id strongly consider moving in this direction. Does your current setup show this issue while shifting or when you’re on chunky trails? If when shifting, there are limit screws on the front derailer that will prevent this. If the chain “bounces” off ring and drops to the BB, you may be able to find a chain guide however id recommend moving to a single ring at the point. Newer rear derailers are spring loaded and add tension to the chain so to minimize this.