Broken: 2.83.10, 2.91.2, master @ 927d099ec099e176b6e1f65555cbd4e70f681301
Short description of error
When a shader combines two SSS closures with a Mix Closure node, path tracing renders the result as too dark. Branched path tracing gives the expected result.
Exact steps for others to reproduce the error
Open attached file.
Render it twice, once with "path tracing" selected and once with "branched path tracing".