How do hydraulic flat tappet lifters fail?

Just went thru similar ordeal on a newly purchased Dodge 886
Low miles under 40 thousand engine popped as u throttled it up
Well after removing intake found a wipped out cam lobe so being truck is very heavy I ordered an Isky towing cam and luckily all went well
I soaked lifters used Isky lube with cam and dumped a bottle of stp over cam before putting intake on
I guess THIS TIME luck was on my side about 500 miles on said cam and zero issues also purchased Summit brand lifters from a member .

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Wow, sorry that happened to you. I guess it's been said before in this thread, it doesn't really matter why it happened at this point - we just know it happened and now it's time to fix it.