Surface validation fails when portal is shot in the exact center of a block

[Adrodoc]

The surface validation fails when a portal is shot in the exact center of a block. This is almost undetectable with bow and arrow, because the y coordinate has to be exactly in the center of a block (for instance 58.5). This is also an issue when using the remote interface to create a portal. For the latter a workaround is to not summon the param entity in the exact center of a block.

To reproduce this bug with an arrow you can use a command like this:

/summon arrow -1494.1 58.5 -409 {damage:5.5,Motion:[10.0,0.0,0.0]}

This bug is caused by https://bugs.mojang.com/browse/MC-111789.