I have been finding the same Robin and have barely hoed my garlic for exactly that reason, except where there were patches of clover seedlings from the manure.
I am intrigued that you are dry enought to hoe? Here is damp every day and no chance athough this weekend one could on any beds with many small seedling weeds. I am impressed that you found only one slug, perhaps because your soil is lighter than mine: I cut some Spring Hero cabbage and found half a dozen small grey ones in each, and my spinach has some holes. Plants are surviving but with some damage.