Commands in Repeating Command Blocks not immediately firing upon world load

Release_749880
1.2.13 Beta 4 Dev

Note: The map file is too large for this form, so I've linked it in the Noxcrew Slack channel. Feel free to message me if you need it sent to you directly.

Summary: Repeating command blocks that are active aren't immediately succeeding with commands upon world load. In the example I'm attaching, they're loaded in a ticking area. I attempted to run the test with a "say hi" command in a chain block off the end of the repeating block, and the text loaded. This suggests to me there's a good chance that it's something to do with the way the entities are loaded upon world load, but it's tough to tell what's actually happening.

Impact: Systems that require continuous activation to work will break.

Repro Steps:
1. Double click the piratecannons20hzbug.mcworld file and open it with cheats active
2. PAY ATTENTION! You should see 3 crazy ugly looking skeleton horse things fall out of the sky and through the world in front of you off the edge of the ship.
3. Re-install the world and open to see the same thing again.

>> /tp @p 1489 49 6 -90 55 will make you look at the 9 repeating command blocks that control the location of those markers that have fallen out of the sky.

Observed Results:
The marker entities (skeleton horse things) fall out of the sky.

Expected Results:
The marker entities should remain tp-locked to their position.

Screenshots/Videos attached: No