Observer and dropper PendingTick evaluation order differs between Realms and Singleplayer

Short description of the issue: In a vertical dropper item elevator powered by a comparator clock and two adjacent observer columns, transferring a batch of 16 items from a hopper chain into an upper double chest works flawlessly in a local Singleplayer world (all 16 items reach the chest). However, when uploading and running the exact same world on a Minecraft Realm, 1 item consistently gets stuck inside the 3rd dropper from the bottom, resulting in only 15 items reaching the chest.

Steps to reproduce the issue:
1. Build a vertical column of 8 upward-facing droppers leading into a double chest at the top.
2. Attach a horizontal hopper chain feeding into the bottom (1st) dropper.

3. Build a comparator-repeater auto-dropper clock connected to the bottom dropper to detect incoming items.

4. Place two vertical observer columns alongside the dropper tower to transmit the redstone pulse upwards and power each dropper sequentially.

5. In Singleplayer, place 16 stackable items (e.g., 16 Redstone Dust) into the input hopper and wait for the system to finish transferring.

6. Upload this exact same world to a Minecraft Realm, clear the top chest, and place 16 Redstone Dust into the same input hopper.

7. Inspect the top chest and the droppers in the vertical column once the clock stops.

Expected result: All 16 items should be transported all the way up into the top chest on Realms, leaving all droppers completely empty, matching the behavior in Singleplayer.

Actual result: While all 16 items reach the top chest in Singleplayer, on Realms only 15 items reach the top chest. Exactly 1 item consistently remains stuck inside the 3rd dropper from the bottom every time the batch transfer finishes.