Krikri::VariableSubstitutor::TemplateSyntaxError
Raised when a {{ span in a plain task param/var value has no
closing }} at all ({{ var) or has a stray single } before it
({{ var }) - the kostiantyn-nemchenko.patroni round-72000 open
gap. Real ansible-core's Jinja2 hard-errors on both shapes
(live-verified 2.19.4: "Syntax error in template: unexpected '}'"
and "Syntax error in template: unexpected end of template, expected
'end of print statement'."), where this engine's scanner used to
copy the malformed text through verbatim and keep playing on.