Expecting end of input, "RPAREN", "ADD", "SUB", "MUL", "DIV", got unexpected "UNKNOWN_DIMENSION"

Expecting end of input, "RPAREN", "ADD", "SUB", "MUL", "DIV", got unexpected "UNKNOWN_DIMENSION"

• 警告信息如上
• vue2 ，我使用 npx @dcloudio/uvm@latest 更新过，应该是当前最新的环境了；

pageStatic/statement/index.wxss from Css Minimizer plugin  
postcss-calc: ..\pageStatic\statement\index.wxss:76:3: Parse error on line 1:  
50% - 13.46rpx  
--------^  
Expecting end of input, "RPAREN", "ADD", "SUB", "MUL", "DIV", got unexpected "UNKNOWN_DIMENSION"

• 是 vue 文件中的

top: calc(50% - 13.46rpx);

• 有搜索一下，但是，没看明白， 社区有懂的兄弟讲解一下！（搜索到的 issue 如下）

# Parse error with CSS custom properties with default values including a nested calc #77  
https://github.com/postcss/postcss-calc/issues/77  

# Expecting end of input, "ADD", "SUB", "MUL", "DIV", got unexpected "RPAREN" #1816  
https://github.com/sampotts/plyr/issues/1816