Hmm... At least now we know that the bug comes from the botanical center indeed, that will make it easier for the developer to fix it if he know where to look for. :-)
I don't remember having done anything else beside quitting the game and relaunch it... Ah! Yes, I did something. In order to check if the issue concerned only the botanical center, I tried to fire my weapons in each area on my way to the botanical center.
Maybe it is what solved my issue? Try it and let me know. ;-)