the Last subscripted Greek letter causes error

[idealkindom]

Description

In the following mermaid code the last subscripted Greek letter causes error. If you delete the subscript it's OK:

graph TD
A[12]-->B[$$R=R \lparen f_c,f_y,a_k,...\rparen/\alpha_{Rd}$$];
A-->C[$$R=R\lparen f_c,f_y,a_k,...\rparen/\gamma_{Rd}$$]

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In KaTex the content could be rendered descently:

$R=R \lparen f_c,f_y,a_k,...\rparen/\alpha_{Rd}$
$R=R\lparen f_c,f_y,a_k,...\rparen/\gamma_{Rd}$

Steps to reproduce

1. Copy my code here to live mermaid to see:

graph TD
A[12]-->B[$$R=R \lparen f_c,f_y,a_k,...\rparen/\alpha_{Rd}$$];
A-->C[$$R=R\lparen f_c,f_y,a_k,...\rparen/\gamma_{Rd}$$]

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Screenshots

Code Sample

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Setup

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• Browser and Version: [Chrome, Edge, Firefox]

Suggested Solutions

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Additional Context

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