I try to avoid snacking because anything over 10g carbs requires insulin & if it’s within 4hrs of taking insulin there’s a hypo risk. Instead I have a stash of low carb snacks - cottage cheese, Pork scratchings, cucumber, crab sticks, cooked meats, salami, peanuts - that I can eat mostly worry free.
I use carbs & cals to track what I’m eating. Try tracking your carb intake for the next few days, it might be that your tea is less carb heavy than your breakfast.
For example 2 slices of bread is roughly 30g carbs (changes with different brands) whereas a salad could be as low as 5g depending on what you have on it. If you give the same dose for each meal you get very different results.
In the early days it’s really hard to know how to eat to your doses so keeping track of carbs & test results will help you puzzle things out. Eventually you will get more practiced & you can make more nuanced decisions.