Unresponsive/invisible blocks

We have a small area on our map in which all interactive blocks have become unresponsive and some are invisible. For example, several chests are invisible, but not interactable. Several signs are invisible. Barrels cannot be opened. Dispensers, pistons, observers, and hoppers are not doing their tasks as they should (items just rest above these hoppers. The issue is seemingly resolved by breaking and replacing the blocks, but would be annoying to rebuild. Wondering if a patch could fix the issue.