Rollup Version

4.46.1

Operating System (or Browser)

all

Node Version (if applicable)

No response

Link To Reproduction

https://rollupjs.org/repl/?version=4.46.1&shareable=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

Expected Behaviour

Expected behavior is here,
the unitlessKeys object shouldn't be emptied (see the name in unitless check), as is the case in 4.45.3 and earlier.
styled-components uses this to determine wether to add px units to CSS like flex: 1.

Actual Behaviour

It removes all properties and this breaks projects that use styled-components with vite. Projects that use rollup to build npm libraries are unaffected, since styled-components is typically a peer dependency and thus marked as external in those cases.