Implicit region misses definitions

I’m running the code

eq1[v_] := eq1[v] = v[[2]] + Tan[[Pi]/6] v[[1]];

In[271]:= Region@ImplicitRegion[eq1[{x, y}] == 4 && 0 < x < 2, {x, y}]

Out[271]= Region[
ImplicitRegion[
And[And[80.61330507707726, 0 < x < 69.81317007977395] == 4, 
   0 < x < 2], {x, y}]]

This output is not recognized as a region, while by typing differently, I get the output that I want

Region@ImplicitRegion[x/Sqrt[3] + y == 4 && 0 < x < 2, {x, y}]

Why is that??? There is something wrong with how I write the code???