bug: data yields into incorrect table when nesting manually

[joscha]

Description

I noticed in a real-life environment that mixing yields without markers and markers sometimes pushes data into the wrong table.
I was able to create a test case that reproduces it.

The expected outcome is 4 tables, looking like this:

things:

id
1000
2000

things_a:

id	my_resource_id	value
a	1000	1
a	2000	4

things_b:

id	my_resource_id	value
b	1000	2
b	2000	5

things_c:

id	my_resource_id	value
c	1000	3
c	2000	6

but instead things_c receives an additional item intended for the non-marked table things, so it looks like this:

things_c:

id	my_resource_id	value
c	1000	3
2000	None	None
c	2000	6

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