Cannot place signs on ladders

Attempting to place a sign on a ladder will cause the sign to either not be placed at all, or be placed on an adjacent block in front of the ladder.

Steps to Reproduce:

1. Recreate the following setup:
   

   [media]

2. Attempt to place the sign on the ladder

Expected & Observed Results:

❌ - The sign is placed with it's supporting block as the adjacent sign.
✔ - The sign would be placed on the ladder.

Screenshots/Videos:

Provided by @unknown