Skyblock Zero release 35
Luanti 5.11.0
Steps to reproduce:
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Place a Storinator, a Filter-Injector and a Pattern Storinator next to each other like in the following picture:

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In the Filter-Injector, place a stack of 1 glass and set exact match to on:

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In the Pattern Storinator, set a stack of 2 glass in the pattern zone:
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In the input Storinator, observe as the stack gets incremented to a seemingly unlimited size.