What are persistent Temp Job allocations used for in 2019?

I'm trying to reconcile the difference in memory used after some development and an upgrade from 2018.4.14f1 to 2019.3.10f1 on iOS. For example, 2019 uses 80-100MB more memory on a specific device in the same scenario that can't be accounted for by additional content. Details were originally posted in the Profiler Preview forum, but I have some related questions.

I discovered some entries in the 2019 Native Memory Region section with the following labels:

• ALLOC_TEMP_JOB_ASYNC (block: <id>) [size description]
• Stack Allocator: ALLOC_TEMP_THREAD: Memory Block
• Stack Allocator: ALLOC_TEMP_THREAD: Virtual Memory Block

They are not present in 2018 and total at least 35MB. 2018 has only 1MB worth of similar allocations labeled ALLOC_TEMP_JOB (block: <id>).

What high-level feature(s) could these pertain to that I could enable/disable to further determine their origin? Can I cross-examine this with anything in an Instruments Allocation profile?