With the “Get science packs for technology” option and the Flammables technology as the input signal, the combinator produces no outputs. Tested on Factorio 2.1.20 with Space Age and Editor Extensions.

Here's a blueprint that demonstrates the bug:

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I dug through the code a bit and the issue seems to be caused by the fact that the mod only calculates ingredients for technologies with unlocks (code) but the Flammables tech doesn't directly unlock anything.

Posted a fix.