Nature and Infinity.
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There are two separate infinite substances that exist in Nature:
“infinitely big” and “infinitely small”.
The infinitely big substance is Zero Vacuum: T=0K.
( spacetime continues forever)
The infinitely small substance is Planck’s constant –

quantum of light - ( h, h*).
These two constants are fundament of creation everything in Nature.
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Best wishes.
Israel Socratus.
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Planck’s length has, well, extension, it is not infinitely small. You could come up with a smaller number rather easily.
NOt saying it is a real limit or not, but it not infinitely small.