When placing blocks on my Minecraft Realms, some of them disappear, I can drag and drop place only two blocks then the blocks stop placing.

I have been having a consistent issue when trying to place a large amount of blocks in Realms (this problem effects myself and those that join in on the Realm). When I go to place a block, in the past I would be able to place, hold and drag so that I can place multiple blocks in a row. Now when I try to do it, it only places up to two blocks and then begins to disappear.

I have looked into this, to see if it is perhaps across my entire Minecraft game, outside of Realms, but in the normal game play it appears to be 100% fine.

If I could please ask for assistance on this matter as it makes the process of building incredibly difficult and much longer.