The template is https://nl.wikipedia.org/wiki/Sjabloon:Infobox_luchthaven , and you can see examples at https://nl.wikipedia.org/w/index.php?title=Vliegbasis_Eindhoven&veaction=edit or https://nl.wikipedia.org/wiki/Luchthaven_Schiphol?veaction=edit . Tagging @Arlolra who's a wizard with templates (and can tell if Parsoiders need to be involved).
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Clearly a Parsoid-related issue. The template (which generates a table) has several tables inside, and their closing |} are "indented" with some leading spaces (this is visible in template expansion). Parsoid misparses one of these as preformatted text, thus one of the tables is unclosed, this everything following the template gets included in the table it generates. Perhaps related to the use of {{!}} to build the tables?
Reproducible with this test snippet. There are space chars on the 3 lines after "|foo". It looks at least 2 empty lines with an empty leading space is required for the indented " |}" to be tokenized as a string instead of a table end tag.
{| |foo |}
Change 182378 had a related patch set uploaded (by Subramanya Sastry):
T85627: Fix edge case tokenizing table lines