I hooked up an old sensor to a breadboard so it was easy to run all 3 and they all read 1us or 0 distance. I reinserted the old one and it read what it always does in this setup. I haven't seen or felt anything strange. In any case, the new ones look great and have fewer components than the old ones. They are "not available now" so I will try to get my money back and buy more elsewhere.
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