Custom structures get cut off at chunk borders when naturally generating in a world

Still an issue in 1.16.20.54

Still an issue in 1.16.100.52

Still an issue in 1.16.100.53

This is still an issue in 1.16.100.55

The release notes stated that "Structures are no longer cut off when loaded using the /structure command" and while that is true, this has unfortunately had no affect on the very same structures when loaded as part of an add-on.

Please fix.

This bug is still an issue in 1.16.200.52

Sadly still affects the latest betas all the way up to 1.16.210.56.

Can confirm this still happens in 1.16.210.60

Currently the largest structures you can get are 48x48, you have to offset them by -16 in each direction (not y), this however removes the ability to rotate larger structures as they'll just get cut off. The other way to load large structures is to set up a command block structure that gets a redstone block placed after to use a structure command, again still more complicated than having structures place properly during generation.

Please provide an addon used and/or reproduction steps.

To reproduce this bug, just make a structure larger than 48x48, save it as a structure and make it spawn naturally in the world using features ad feature rules. Give it a high scatter chance so you don't need to look long. It doesn't happen all the time, but happens pretty frequently. It seems to cut off structures at chunk borders, Even small structures have a chance of getting cut at chunk borders, but large structures are almost always cut.

I have attached an addon showcasing the problem above with a large structure. Experimental toggles must be enabled. 

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This is still occurring in 1.18 betas, I've also seen instances of vanilla trees being cut at world borders now. Seeing as this report hasn't been updated yet, could a mod add the following to the report?

Steps To Reproduce:

1. Download the attached StructureCutBugTest.zip and install the behaviour pack

2. Load a world with the pack

3. Observe that supplied structure gets cut off at chunk borders

Observed Results:

• The structure gets cut off at chunk borders, the largest size structure possible for some reason is 48x48, though since the new terrain generation, any structure has the potential to get cut along a chunk border, even smaller structures or features like trees.

Expected Results:

• All structures are placed properly during terrain generation and creators are able to chain large structures together (using sequence and scatter features) without structures being cut off at chunk borders.

affects 1.19.51