glowing mushrooms actually sounds neat rather than an issue, it would be nice for the brown mushroom to have some sort of use, as the other 3 mushrooms are all vibrant and stand out. it would be hilarious if Mojang were to take this and run with it as a land version for the Sea Pickle...
the Export button doesn't seem to actually make a file to import, at least on my computer. I've spent several hours trying to find the file, then tried making another, using settings to check the to the single byte storage of both my drives, there was no change before/after selecting Export. so I tried recreating a world, and trying again with the new world, the Export button does not seem to work.