I attempted to craft the sealant, but the recipe in REI was just one Honey Bottle, instead of having the Slime Ball as it shows on the wiki. This ends up crafting 3 sugar, and I couldn't craft it even with Polymorph. I tested this on an instance by itself, and had the same problem. Thankfully, I was able to pull up the recipe using CraftTweaker and found the problem. The recipe is missing the underscore for the Slime Ball. It looks like this:

craftingTable.addShapeless("chiselsandbits:sealant", item:chiselsandbits:sealant, [tag:item:c:slimeballs, item:minecraft:honey_bottle]);

This is also the case in 21.1.24, but I didn't test any earlier versions or the other launcher versions. Rewriting the recipe in CraftTweaker with the underscore fixed the problem.