@Aklapper I think this can be fixed from MediaWiki core and would be more efficient than leaving it for every install/wiki to manually fix. The attribute will need to be added only once where the togglelink/content is generated.

buildDefaultToggleLink = function () {
 return $( '<a>' )
        .addClass( 'mw-collapsible-text' )
	.text( collapseText )
	.wrap( '<span class="mw-collapsible-toggle mw-collapsible-toggle-default"></span>' )
	.parent()
	.attr( {
	    role: 'button',
	   tabindex: 0
	} );
};

I think the data-nosnippet attribute just need to be added to the span class that wraps the text:

...
  text( collapseText )
  .wrap( '<span class="mw-collapsible-toggle mw-collapsible-toggle-default data-nosnippet"></span>' )
...

I can't reproduce this with the URL given:
https://www.google.co.uk/search?client=firefox-b-1-d&sxsrf=ALeKk01a83qQHF_kpngXJbDVaMksZkpEEQ%3A1610504186587&ei=-lf-X7-lI6vf9AOU_qXQDg&q=list+of+longest-running+scripted+u.s.+primetime+television+series&oq=list+of+longest-running+scripted+u.s.+primetime+television+series&gs_lcp=CgZwc3ktYWIQAzIECCMQJzoECAAQR1CchQFYjIwBYP6NAWgAcAJ4AIABowGIAdIDkgEDMi4ymAEAoAEBqgEHZ3dzLXdpesgBCMABAQ&sclient=psy-ab&ved=0ahUKEwi_is3P65fuAhWrL30KHRR_CeoQ4dUDCAw&uact=5

Did this get fixed?

@Jdlrobson As suggested by Aklapper, I posted this to Wikipedia's Village Pump (technical), and some helpful users resolved the issue for that specific local wiki by simply removing the collapsibility of the table.

As for the issue in general - Izno contributed to the Village Pump post: "Generally, no tables should be collapsible in mainspace (see WP:MOSCOLLAPSE)"

As far as I see it, as long as Wiki posters follow the Manual of Style, this issue shouldn't be a problem and I have yet to encounter it again.