HI! For me no problem ok yeah i just gotta restart. But you can track back what i did: I just removed those blocks, then growing that plant over the raft, all across the water to the other side. Just prevent that possibility. So maybe 'easy' solutions:
a) in code: make sure the plants cannot grow over the rafts [just as the rafts cannot sail over the stems], and/or
b) in layout: redesign that bay; assemble some brown blocks of 'ground', so that this specific plant cannot grow beyond the raft, while the raft further can do a little zig-zag out of that bay (and continue through the other side).
Hope this helps.