Cannot use calc between percetage and px in frontend_assets

[simplify-m109]

Impacted versions: v15, v14

Steps to reproduce: Add css to element; "left: calc(50% - 50px);"

Current behavior: Throws out an error of Error: Incompatible units: 'px' and '%'. on line 13124 of stdin; This error occurred while compiling the bundle 'web.assets_frontend' containing:

Expected behavior: /

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