I've worked on more than a couple residential dehum which do not have a freeze stat.

And, one time I worked on one (hanging from the ceiling of a commercial property's cellar) where the freeze stat was unclipped from the line, and hanging free. They had been turning the unit off every couple days to thaw. I clipped the freeze stat back on, and put on some tape and tie straps to help keep it in place. I'm guessing some ignorant person unclipped the freeze stat.

A creative person could use a thermostat of the proper temp range, to act as a freeze stat. Set for about 40F, it would allow the coils to be cold, but not frozen.
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Christopher A. Young
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If the temperature sensor does open the contacts when the temp gets
down to freezing, then why were you having the original problem of the
unit not shutting off/ cycling on and off before it iced up? I'm
confused (happens more frequently the older I get)g.