Harvest Bug - Always 3 Tier 3 Plants

I am testing out a new strategy in Phrecia 2. I stacked increased chance of tier 3 plants (440%) and tier 4 plants (562%). For every map so far (tested 5), every crop has exactly 3 tier 3 plants. Never more, never less. There was also no tier 4 plants. I tested the scarab that forces tier 4 plants, and I got all crops having 3 tier 3 plants and then some having tier 4. It seems like the is a hard coded cap on 3 tier 3 plants. Obviously crop rotation can have more so this seems like a bug and not a feature.

Thanks a lot for your tests. I was exactly planning on this strat, but wasn't sure if the "increased chance of tier 3 plants" stacking work. Regarding tier 4, as far as I know, its very rare to get tier 4 even with high chance. I saw a reddit post of someone who got only 13 times in 50 maps. Also the wording is a bit different. It says "a tier 4 plant", not "tier 4 plants". There were rare incident of people finding 2 tier 4 plant by stacking this mod.