In the current build Poland in 1936 starts with the 1918 Renault FT tech. I do know that the game is not 100% realistic due to balancing issues and so on and that insignificant numbers of something like 20 tanks in 1936 wouldn't be represented in the game.
But the fact is that in 1936 Poland already had produced 190 TKS with further 90 in 1936 for a total of 280 (6 were sold to Estonia in 1934 leaving Poland with 274) at the end of its production cycle. Represented by the 1934 TKS/Light Tank I. Poland also produced around 300 TK-3's (Production years 1931-1933).
Interesting but TKS hardly qualify as light tank.
Wikipedia classify it as tankette https://en.wikipedia.org/wiki/Tankette and for good reasons.