REM units no longer work with Base Font

Hello Balbooa,
All my websites are currently GB v 2.18.2. On these websites, I configure the Theme Base Font and Paragraph fonts sizes (in px), a large size for desktop, and slightly small font size for Phone Landscape & Portrait. The font size for all the Theme headings are in REM.

This works well - when the view is Phone Landscape & Portrait, all the headings automatically reduce in size, as the Heading font size REM unit is based on the Base Font size. I.e. by just changing the Theme Base font, all the heading font sizes will adjust relatively.

However, with the latest GB (v2.19.0.4) this no longer works. If the Theme heading font size is set to REM, changing the Theme Base Font has no affect on the heading size.

I've included some images for you to try out. Could you please check.

Many thanks,
Marc

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