dates dont regrow with dates_regrow_pollinated

[blaboing]

Noticed on a server that dates dont regrow there and tried to find the problem in singleplayer.

After adding some debug messages to the on_timer function "dates_growfn" I noticed it was never called for "moretrees:dates_f0" nodes.
Without "dates_growfn" the dates wont advance to the next stage, I placed some "f1" and they advanced without a problem.

But after using an luablock ingame to get the on_timer value of "f0" dates newly placed "f0" work as intended while old ones still wont grow.
I couldnt find why "dates_growfn" isnt called for "moretrees:dates_f0" but wanted to share what I found atleast.