If there are multiple <triangles> nodes under the same <geometry> node, the .dae file cannot be displayed in flexsim. I have put a snapshot as follows, this file is not supported in flexsim.
I can find nothing in the collada specification to support your assertion that multiple <triangles> elements are allowed under the same <geometry> element.
Please provide supporting evidence from the specification if you want us to add an issue to the development list.
"The <triangles> element declares the binding of geometric primitives and vertex attributes for a <mesh> element."
COLLADA – Digital Asset Schema Release 1.5.0 Specification (khronos.org)
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