We were playing on our sponge based HermitCraft server (v1.4.0) on 1.10 and I was setting up some botania mana gen. A creeper came along and blew up next to our pure daisies. Instead of breaking the blocks and daisies (as we have mob griefing turned off), the pure daisies turned into missing textures. I broke the flowers and got the achievement that told me to report the flower and the method that i attained it. This occurence happened in an area that was not claimed, and it was on a sponge based forge server.

Attached are the flowers and achievement:

does it happen every time and does it happen without sponge?

unable to reproduce on this end with sponge-free single player and /gamerule mobGriefing false, it might be a weird glitch in a mob griefing mod?

Tested this in a private server with no sponge, no issue found. Tested it in SSP, no issue found. Tried it in sponge, issue found. I also tested it with the psi gun in SSP and non-sponge server with the Explode trick and an issue was found on all 3.

Also sorry it took me this long to reply, I had to deal with something earlier last night (uk time)

Is it a specific sponge plugin or just sponge in general?

We have griefprevention on our sponge server

if you remove it does this still happen?

With our setup, we have not had a proper chance to do so at this time. It is something we will try in the near future, but as of this moment, our server guy is having a hard time keeping up with some other problems.

I have managed to test this in a private server, but without any other plugins, just sponge and forge. I hope this helps