If one were to place any potion tipped arrow in an item frame and pick block it, a Water Bottle Tipped Arrow will be received.
Linked issues
is duplicated by 6
MC-84200
Picking a arrow out of a item frame in creative is buggy
Resolved
MC-84382
arrow problem
Resolved
MC-84561
Using pick block on all tipped arrows in item frames gives you arrow of splashing.
Resolved
MC-85396
Item frame and new arrows not work
Resolved
MC-85802
TIpped arrows and Item Frames
Resolved
1 more links
This seems like this relates to another bug, as there has been issues with middle click on item frames glitching out, and not getting the NBT of the item.